350 aggresive surging in gear with moderate throttle.

[laxmax44]

well me and my friend are wrapping up his 94 s10 project. the 4cyl popped and we found a decent 350 for real cheap so we figured with put that instead. more work than we expected but its pretty much finsihed up. its paired with t5 and some basic edelbrock carb. we finally got it to run after a few days of frustration. it was all timing related. (ill admit we really dont know wtf were doing...) but anyway yea. its now set initially at 12. then jumps up a good bit when reved up. but not sure how high exactly since it then goes off the little chart thing on the balancer. but the timing seems perfect now. it idles dead smooth and starts instantly with no pumping the pedal. once its fully warmed up we get in to test it. if your very very light on the throttle and accelerate very slowly its fine. were talking barely a normal street start. but if you try to accelerate with like 1/2 inch of pedal travel it lurches foward, the falls on its face, and repeats a few times till you let off. it will actually lay rubber doing this, only it looks like this on the road - - - -
we thought it was a carb problem so we borrowed another stock 4 barrel, basically the same that we have it does the exact same thing. so what gives? any help is appreciated, thanks!

o yea, and while idleing you can free rev it all you want and its fine. its just when your actually trying to drive, even in just first gear so there shouldnt be much load on it.