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Disc brakes require about 50% more line pressure than drums. So I would use the smaller diam m/c which will produce more line pressure. You will have to check with the manufacturer if the smaller m/c has enough volume to work with the intended calipers.

Yup, & that requires a lot of ign timing at low rpms. One of the reasons racers use locked dists with big cams.

The later cranks that work with the 727 have threaded holes in the flange; the earlier ones have plain holes, drilled through. Lifters. I wouldn't use anything made after 1995. Solids would be real hard to find. I get pre-95 OEM lifters from a junk engine & have them re-faced. I modify the...

Carter & Edel 4bbl carbs will take up to 10 psi of fuel pressure; but you need to re-adjust float level. The Edel/5.5 psi 'thing' is because fuel pressure controls the fuel level in the bowls & the 'datum' jetting [ not rich, not lean ] is set with 5.5 psi & 7/16" float level. I would NOT use an...

[1] Is fuel dribbling from the primary booster nozzles? [2] You need to disassemble the carb & check that the o rings are in place. I NEVER use the factory O rings, they are too flimsy. Instead, get fuel resistant standard O rings, 3/8" OD & 1/16" wall thickness. Get those first. [3] Fuel...

I have 265* @ 050 for the MP 590 cam. No way that cam will run/idle best with 12-15* idle timing.

[1] Get a custom ground solid flat tappet from Comp Cams. I am getting one done now, $388. They have dedicated Mopar lobes that have more lift & area under the curve than Chebby & Ferd lobes. [2] Be aware that the crank flange prior to 1962 will not accept a 727.

I have been grinding an oiling groove down the side of the lifter body for over 30 yrs.

It is very easy to determine the BEST idle timing. Adjust idle mixture screws for best idle. Engine idling, SLOWLY rotate dist CW until you get the highest rpm. Toggle dist to make sure highest rpm. Now check the timing. It wouldn't surprise me if it was 30-40*. It may have enough vac for p/brakes.

It is a bit hard to see, but Crower places the EDM hole off centre.

Flat tappet cam? Wiped lobes or tappets not adjusted correctly.

Polys 1962 & later. Early Polys a different crank flange.

Post#4. You have lost me. The idle jets on the exterior....I presume you mean the idle mixture screws. What do you mean mate to the float?

That is the WORST place to put EDM holes because it is where the max load is. You are taking away surface area where it is most needed. EDM hole should be off centre.

That should have the ball & trunnion U joint up front. They can be clunky when they wear. If it is old, has mileage on it, it should be replaced. With a GV, you might need to hack into the trans tunnel/floor pan.

What heat range are the plugs?

Good post^^^^^. Chrys used low-er taper lifters on the 6 pack & I believe the Hemis. The lifter rotation would have been slower, but more contact area.

Pontiac built an experimental 427 OHC engine in the 60s. One of the Pontiac engineers, 'Mac' Mc Kellar got one & put it in his daily driver.

N/seats could be jamming in the closed position. So no fuel will enter the carb. Remove carb top. Hold up & watch floats drop down. Needles should drop with floats. If not they are binding. Unless the n/seats are severely worn, I do not use them in current o'haul kits. Don't trust them.

Pretty sure EPDM refers to the material that the insulation is made of....not the metal core. Be careful with the 'hype'. MSD plug leads are advertised as 'silicon'. Only the outer red or black jacket is silicon. The white inner material is EPDM.