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then you would need a 1430# rod 62x52 stock is 65x52

nice looking engine I bet the rest of the car is nice too.

when they go lean like that using smaller rods for the cruise mode will help. go one step like 73 to a 70 see if that helps

were you using the mixture screws on both carbs. the stock iron intakes are bad look how short they are.

Ok 2 things still bother me lol. that converter is just slipping and eating up power with 3.23 gears. The other thing might not be true but those heads if not done right with bigger valves and being hog out and losing their velocity will kill bottom end torque.

mine runs best with 89 secondary jets and 73x47 rods with the 98 primary jets that help keep the plugs clean at cruising speed. I am sure every engine is different.

I think you will need a fuel pressure regulator with that fuel pump

These are the instructions that came with ch28 intake when I bought it new from edelbrock many years ago. they sent the jets with the intake.

the 500 cfm will kill performance I tried them and went back to the 600 cfm.

why would you start with stock jets in the 1405 carbs when you buy the ch28 intake Edelbrock sends you the right jets to start with. maybe you didn't see post 5#. then you could go from there up or down.

stock primary are 100 jets and stock secondary are 95 jets

yes and sell the single plane and put on a rpm performer intake and help both more.

2x4 ch28 intake

98 primary and 86 secondary with stock 1405 70x47 metering rods

it's about 2 sizes smaller than the 509 should be good

what cam are you putting in ?

if the stall is too high for the 3.23 when cruising it will be slipping

not sure the cam is your only problem. 509 should turn on at 3500-3800 rpms. if i read right your running a 3500 rpm converter with 3.23 gears that's not good.

am confused the 346 was made from 1971-1973 and are opened chambered.

a new cam would be good with high lift and less duration @.50 the 509 was [email protected]. it will get your cylinder pressure higher and more torque. plus knowing it's degree in. sometimes the timing chain and gears are messed up.