Speedmaster spark plug holes improvement??

PRH said
I estimate that a more well thought out overall combination of parts could have bettered that 331hp by another 40-50hp without really spending any more $$$.
Mainly, compression and the intake manifold.

The XE268 in a small block with half way decent heads is an easy 1hp/ci cam.

Well I have plenty of the two mentioned LOL... I'm not really dead set on which head gasket I'm going to use until I pull my current heads off. Paperwork says .010 above deck which is basically the .010 they shaved off the deck.. I have in mind a simple 8553 gasket, but again until I get the motor out on my stand and the heads off I'm Not Dead set..