I am on a long weekend and typing on a phone.
One other thing to take into consideration on pistons. You will also need rings. All my piston kits come with rings.
Not on my site yet but in stock is another 250 piston choice. It is a lower compression unit and has a 18CC dish. Provides 8.5 ish with a 70CC chamber. In .040.


Inliner Member 1716
65 Chevelle Wagon and 41 Hudson Pickup
Information and parts www.12bolt.com