My engine is a 350 with a mild truck cam. It has the older style quadrajet manifold for it. Was going to use a single plane adapter. I curently have an Edelbrock 600 cfm carb for it model 1406 non emission. I have posted many times in reguards to inlines. Had a 292 in there but 8 mpg on a brand new motor was hard to deal with. So it was back to a V8 which does better. Still love the ole inlines though. Anyhow just curious if the 2" would help any or just use a one inch. Thanks JoeH