You will definately be glad you switched over to a boosted engine even @ the low 6 psi range, much better than just a bolt on 4 bbl intake & carb & dual exhaust w/headers, dont get me wrong, but as soon as you get up to 10 psi & more, the smile on your face will get much bigger, that's all.
When you force air into your engine, cylinder design is not as critical as a naturally aspirated engine.
So in short, you do not need to install lump ports,oversized valves, porting.
Probably just shim up your stock valve springs or install some stock 300 HP 350 SBC valve springs.
You could buy a complete worked cyl head, but plan on spending @ least $1100 for oversived valves porting, lumps installed,new springs, screw in studs etc, etc, this type of head can wait. Plan on a better head after you build a nice shortblock.
