I have the D0VE block that is +30. With the KB pistons, the 6.7" rods, 4.14" crank and the 71 cc Jon Kaase Ford heads you have a comfortable 9.9 to 1 compression ratio. I believe the block has +5 in case it needs to be decked again. I used the Crane hydraulic roller cam and a dual plane Edelbrock. With the JK heads and .618" lift, there was no need to clearance the valves. Plenty of room. It runs 60 lbs
oil at 1500 RPM and you don't really need to shift much above 5000 RPM. No smog rules because it is an original 1970 block. It runs like a champ.