Heres my 71 Duster:
Just installed some ported and decked edelbrock heads
Comp is 10:1, xe 284 comp cam,yella terra roller rockers
1 7/8 custom headers and 3 inch exhaust running a holley 770 street avenger
Dynoed at 355.7 rwhp
https://youtu.be/Fv3jFjVgADo