The actual CR was around 10.25
10.75 was advertised/approx CR (fluffed a little)
1968 #16 heads are right around 72cc +/-
Yes I got the 10.75:1 compression ratio from the original owner's manual. Sounds good that the 72cc Edelbrock Heads only yield a 10.25:1 compression ratio.
I believe that they may be street-able on pump gas.