post a pic of what you want the engine to look like or the air cleaner you're thinking of and we can better direct you...
so here's the deal on pistons... if you're gonna do pistons why not do ones that maybe bump the compression up. or... if you do stock, why not deck the block to achieve the same? these are questions to ask the machine shop, if you care about such things.
but to your point, stock cast by somebody like speed pro, sealed power or KB will be fine for a stock build.