318 Stroker Build

With the OP's pistons, then it works out to 9.6 SCR with stock 318 heads (675's) and standard Felpro head gaskets. If he changed to the 360 heads, and changed to the Mr Gasket 1121G head gaskets, then he would maintain that nice 9.6 SCR, and have the better head breathing he needs to get to 300+ HP.

Using EQ heads would push the SCR waaaaay up into the 11:1 SCR range, and that will not work with a cam that will give a smooth idle. So one of the factory open chamber heads with 72-73 cc chambers looks like the ticket IMHO. A cam like the Voodoo 10200703, with a 271 advertised duration, would give a DCR of 7.8. That seems like pretty good territory for this app. I think the OP will hit 300+ HP easy-peasy.