318 with a new 4” crankshaft.

Since you're planning on changing out every component on the 318 you might as well change the block to a 340 or 360 block so you can buy some quality off the shelf pistons.

Using KB hyper pistons at 11 to 1, if they even make one for a 318 bore with a 4" stroke crank is just asking for trouble in my opinion.

Also are you wanting to make power or just sound like you have power? Using a Thumper camshaft is a very poor idea if you want real power production.

Tom