vq35SMASH

so heres the deal, im on track for a decent power upgrade to my BONE STOCK BLACK TOP sr. so far ive got a s15 t28, dwerks 550's, Z32 MAF, HKS wastegate. on the way for the rest is a enthalpy tune, tomei procams, turbo SS lines, and a new exhaust manifold since im already there. and my question is this, my friends love the phrase "since your already there might as well...blah blah" and i have a old head off my old RED TOP sr thats been laying around for quite sometime. would it be benificial for me to p&p and do new springs seals and the whole laundry list of possibilities to the head and just put that on when i put the rest of the crap on? if so what would be the best course of action of stock stuff to leave and aftermarket stuff to upgrade too, and cane even a REDTOP head work on a BLACKTOP lower for a s13??

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