383 build

you can have the heads cc'd

if they are 79, you will have around 9.5 compression with a .040" thick head gasket but that will be around .120" of quench/squish clearance if they are not closed chamber.

to increase performance, you could put clay on top of the piston then put the head on with s few lightly tightened bolts then drain 2 lifters than set the lash to zero then turn the engine over then check how thick the clay is in the narrowest portion . i would run a cam that gives the valves no less than around .050" clearance between the piston on the intake and .100" on the exhaust.

after you determine how much lift you can run, look online and see what cam has close to that lift that will rev to where you want it to or have a custom cam made.