Ok, guys....used to have a 280 for 12 years when I was in the service......got the bug again so just picked up a 77 with 4 speed...basic stock engine reubild done 5 years ago with 2,000 miles since....68000 mile car.......I like the sound of an idling cam and to cruise town in the 2200 rpm range for nice resonance....ill never be a racer --- mid 40's guy but mostly want the pretty sound.... also bought an old 240 and it has a header that has two sets of long tube 3 pipes each going into a separate collector and can continue as duals.....it has an e31 head could/hould I consider using it?....I mostly would like to since the car was one of the first 13000 ever made.....Any Thoughts greatly appreciated ! ....retired submariner