Well...you could get yourself some real nice aftermarket pistons and connecting rods so that it won't blow it self to pieces pistons are around 800 rods eh haven't really looked into it but prolly the same. Could also get HKS ballbearing turbos (don't have prices on them) seen them on an RB26 before pretty nasty. And how bout a twin plate clutch (no idea on price also, prolly pretty pricey) also as you prolly know you're gonna need to get a gasket set from like friggin Australia or some place in Cali that will charge an arm and a leg. I realize i'm not too much help but i thought since no one else had posted yet i would share my very limited knowledge.
"It's not the size of the dog in the fight it's the size of the fight in the dog"