Billet wheel journal bearing 67's retail for around $1k or so. Your looking for a t4/3"vband hotside like stated and a 4" inlet, 2.5" outlet on the compressor cover for a direct bolt-in. I have quite a few guys running comp billet 67's with the on3 kit.
How much more power will that make...over the on3 turbo im sure alot more...lol..I do have a stock block so im limited in HP..but want a better turbo...Mine runs great dont get me wrong but it might be a good idea to change it before i do have problems...lol
87 GT Vert.On3 turbo making 14 psi,Trickflow TW 170cc heads,TF street heat intake,70mm TB,stock cam,1.6 roller rockers,Snow performance stage 2 meth kit,42# injectors,340 lph fuel pump,AOD,Lentech VB,electric OD 3000 stall.3.55's