my car originally came with a 2 barrel rochester. i recently upgraded to a 4-barrel edlebrock performer intake and edlebrock 600cfm carb. i want to put a pontiac Q-jet on there but i find it hard to find the correct one(1968) how would my perfomance be affected if i put one on their that is not from the correct year???? i.e. 1970 455 Q-jet??? please give some suggestion and advice! (my car is an original 350 2V 265hp)
