HELP! before i go crazy Options

[D0ctorg00se]

Ok, so i have a '74 2.0 that was carb converted (unkown single dual progressive) when i bought it 5 years ago. Since then i have done the 009 dist, facet fuel pump, etc. (but of course no new cam, yet). Exhaust is monza quad tip, in good shape no holes. The fuel lines have all been replaced. The car has really been a dream considering i live in Blacksburg, VA and drive it daily. I upgraded to dual delorto's which ran fairly well considering they were used but one actually cracked and began to leak fuel into the crankcase. So i just recently put a pair of brand new dual EMPI, HMPX 44's on and i just can't get em right! Now they are synched and linkage should be fine I have recently adjusted the valves and they should be fine (i keep saying "should" be b/c im no expert and if it could be the problem then it could be). The car starts right up, idles fine (not perfect but good enough) and at full throttle it is fine. It is at part throttle that the trouble arises. Basically unless i push it hard past half throttle it runs like crap. Maybe at like an eighth or less it is ok, like easing off really slow. But as soon as i get on the throttle part way it lags, pops, sputters, hisses, jumps, and just has a fit unless i get on it more or feather it goofily. So i've basically tried the mixture anyway it can be (while still being able to start) rich lean whatever and while sometimes it seems better than others its still not where i feel like it should be with a brand new set of carbs. So someone please help me out no mechanics have ever worked on a 914 down here so i hate taking the car in to have some hilljack screw with it. I havent checked/adjusted the timing or dwell yet but im not sure if i need to. Someone please hook me up with some knowledge. I know you gurus have the uber knowledge i need. Let me know what you think.

[lapuwali]

FWIW, I believe the EMPI carbs being referred to are the infamous Chinese-made Weber IDF knockoffs. If that's so, then the 44 refers to the diameter of the throttle plates, not the venturi size. The venturies come out after you remove the top plate, the aux venturi (the smaller tube in the center of the throats), and loosen two bolts on the side of the carb (the side away from the mixture screws). The venturi size should be stamped on the venturi somewhere. 32 to 36mm vents would be roughly what you'd want, with 32s better and low-to-midrange, and 36s better for top-end (but you'll still have some poor running at the low-end).