hey todd,

my 42 webers had 32mm chokes, and with my modded 1200 motor they are too large, they need 30mm chokes,

so id say you need 30 or less even if possible

also what tsillay said aout the heads, they will bolt on, but you will have less compression (good for turbo )

there is also diffrences in the water jackets that go into the inlet manifolds, some have em some dont cant remeber which ones though, and yeah oil delivery diffrences rings a bell for me too

i have an a-14 block that you could try out, theres an a-15 block at pick a part too, or how bout the entire a-14 in the car in your front yard why not use that?