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phase1:
ditch the whole x-pipe and dual exhaust idea, waste of time. too much tubing in both volume and weight, and no performance value with a small motor. shorty headers w/ good y-pipe and a single 3 short system, dumped before the axle, will do the job fine with a 305 or mild 350. i actually may have a good set up sitting in my garage, hit me up on AIM to discuss.
the stall seems good, get yourself a rachet shifter, shift light, and a shift kit. also, wire in a manual lock up. if you are running for time you can flip the swtich and have the TC lock as soon as you hit second. huge improvement to driveline efficiency down track and you can drop some good ET. playing with the switch to find him the sweet spot for best times and traps.
phase2:
no need to spend 700+ on heads for a 305 that you are only putting a mild cam in anyway. look for some used L98 vette heads(58cc) or late 70's 305 heads(58cc) and a performer intake and you will be in good shape. all can be found at swap meets, parts boards, and salvage yards for cheap.
650 carb is a good call. i know nothing about q-jets, the little bit of playing with them i have done convinced me that a holley or demon is a much easier way to go in terms of tuning.
don't forget to add in a few bucks to prepare a good dizzy. mechanical advance is easy to dial in, just have to make sure you are starting with a piece in good shape and go from there.
cam, if it is a roller block you can go the cheap route and just get a stock LT1 or LT4, if it is flat tappet you can save yourself some time and aggrivation of collecting parts by jsut getting a complete cam kit like comp sells.
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