FWIW....I got a Victor manifold from a member here that had not been touched. I bolted it up to my Eddie RPM heads on my 408 and was shocked to see how perfect the intake runners matched the head port openings. The Victor is large enough and straight enough that you can look down each port with a flashlight. I was ready to get out the grinder but pleasantly found they didn't need touched. I probably got lucky with the parts I got. (But make no mistake, that good fortune was more than balanced out by other challenges elsewhere in the car's build!!)