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you can get edlebrock heads in 88cc open chamber, they work well on mine



Those would be easier than doing stock iron open chamber heads , at least you start with chamber depths that are all the same.

I did a couple engines with step head pistons , the first set of heads I machined the chambers by hand on a bridgeport , the second I used a bridgeport with a prototrak and wrote a program to do the half moon cutouts.