1968-9 9.2
1970 8.8
1971-3 8.6
is what I found.
My 70 has 8.8. I should switch to the closed chamber 920's I have on the shelf. That would get back to that 9.2.
A 340 cam,LD4B and 650 AVS2 (also on the shelf) , 340 exhaust manifolds, a higher stall converter, and 3.55's. Naw. I might just keep the stock 318 2 barrel.