Nitroaddict is correct about the "small blocks". The mounting locations are the same for all.

I too have a velocity .17 and considering moving up to a .21. Since I'm a machinist and it’s nothing to throw the chassis into the mill, I may just do it although most say I’ll be overpowering my truck. Thing is, I don’t care. A clutch upgrade, a little different gearing……… Hey, I’m just having fun.