single plane intake, i DID try another carb (holley 750cfm) but it needed rebuilt, but it did do the same thing, which makes me believe it has to be a vacuum leak, or something… I was also thinking it may be a weak ignition, but i couldnt find anything for real cheap.
im not sure, but i do know it was within specs of the cam it has.
the car will run with the idle mixture screws turned in all of the way, which tells me it is bypassing the idle circuit on the carb
edit* i see i have contradicted myself in this post, the weird thing is, is that we looked for all possible vacuum leaks, and fixed them, and the test checks out ok