I have a 69 Barracuda convertible with a slant 6 and the following setup:
Compression is ~9.0:1 (I'd have to go look at my data book for exact)
TRW stock replacement cam (Again, data book for year application p/n)
OD 4 speed, aluminum case
2-1/4 exhaust - entire headpipe to muffler
Reproduction...