Ported head and gasket matchin the stock header??!!

Been rebuilding another motor for boost and decided to see how GM?s quote on better flowing exhaust will give u 30hp and tq... how true idk but we?re gonna find out soon I do know the exhaust side had about a 1/16 -1/8 ? of porting to get it to gasket match and then it dawn on me gotta check the header and sure enough about the same in the same area of the runners as in the cylinders of the head so....on to something here I hope because there?s a free extra ponies if u want it...but will stock injectors handle that much extra air flow or will it have to be forced they with at least 1000cc ink??!! Any one please chime in and also on a boosted note for the ll8 stock bottom end jus new internals how much boost can it handle safely and power...??