I was wanting to know what engine kits are good quality and will not hurt the pocket book to much, and what brands should i stay away from or what brands do you reccomend for gaskets, bearings, pistons, rings. Also would like some ideas on a cam thats not to radicle. I would like to increase some power but changing the heads right now are out of the question at this moment. Any sugestions greatly appreciated

My engine is a 72 chevy 402 going to be bored 30 over
Heads are stock open chamber
Piston are stock 402 open chamber style