Highest LIft cam with 68 340 with stock intake and carb

flyfish said
It is your lack of punctuation that is holding the motor back.... :lol:...j/k

It is your heads that are holding the motor back...and if you don't have adjustable rockers with that cam your motor will probably break very soon...:popcorn:

He has to have some sort of adjustable rockers because it's a solid roller cam.

Unless he has a loose converter and some gear, he needs a different cam.