Just about to FINALLY build up my C4 Its going into a 69 coupe, behind a 331 making around 400ish hp, this car isn't a dedicated drag/race car, just something i'll be bringing out to the 1/8th and maybe some autocross events. I'm going to be using broader performance's 500hp kit with a full manual reverse and ratchet shifter. Are the hardened input shafts really necessary? It will probably see a 100 shot spray at some point once i get the suspension set up right. And is there anything else i should change while i have it out? It also has a 3200 tci street fighter converter. I was also debating on changing it to a gforce t5, and make it handle a little better to try to get into road racing. Does anyone have any experience with them? And are they ok for street use? Thanks!