It was 76 for the last solid web 350. They just need flat top pistons and a bowl hog taken to the #8 heads and use a 2" or 2.072" intake valve. They are stock 1.625" exhaust valve but have lip right under the valve. The port is otherwise decent. Your heads have a 1.5" exhaust valve with an awful port and crack. Early 3 through 7a heads milled with Felpro gaskets will give between 8.5 and 9 to 1 compression with your current pistons. Get the Cloyes billet roller timing set, the factory has the lousy nylon timing gear that falls apart and a cam with at least 215 duration.
