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I have 3.55s with a 28 inch tire on my 70 coronet. . My 440 hums along at 80 just fine. Also 3.23 with same tire in my 66 coronet is great at 80.

4 jack stands, a hydraulic jack and you can swap that flex plate in 2 hrs. Just do it.

2355 work well and a fair price

Also, I recently built two 383s that made 380 hp and had stock intakes with mild cams. At the same compression a 400 would just make more. If you look you can find my posts. I describe everything I did to make about 1 hp per cubic inch very easily.

I have used 2 Hughes cams in 440s. Both perform very well for the size they are. I made 415hp in a 7.5 to 1 440 with one of them.

Just drop the tranny and look.

Weird, because I worked at a performance shop and we never did them unless they were already sunk. And they were rarely ever sunk. And if they are it's usually because of a bad valve job where they've been cut too much. I never have installed seats, never had a problem, and never will.

There's no need to put in hardened valve seats unless you plan on doing lots of heavy towing. Ive worked on old engines for many years and I've only seen a couple with really bad valve seats. The performance shop I worked at, we never installed seats if the original ones were still good. They...

OK, cool. The motor I put back together still ran strong, just needed a bit more stall speed since low compression makes a 383 a little soft on the bottom end.

He's got a low deck block.

Yes it's still high volume, my point is that doesn't mean high pressure.

I put a standard spring in my high volume pump that made too much pressure. It is now standard pressure.

The 750 4779 was a little leaner on the opposite side lower in the pull but evened out.

Another thing I just remembered, the 750 hp was leaner on one side for some reason. I just went through the carb. Everything looked good.

Dang that's moving. What gears did you have?

All the b motors had the smaller AVS. The 750 was 440 only.

I took apart a standard bore 71 383 hp a few years ago. It was around 60 to 70 in the hole. With steel head gaskets and 906 heads, it came out around 8.2 to 1

Here's the 750 4779. We did most pulls with this carb.

It's the factory carb to this engine.

I did not try it with manifolds. I wish I had, pretty sure I've got some shorty pipes around here somewhere too.