i know i just read a post about a guy doing the swap on his bullit and he had about 4500 invested in the swap. i think the tork tech kit is a really nice setup for those who want a top performing twin screw setup for a built motor. the piggy back 8 rib setup really helps combat belt slip when spinning large twin screws sc's. if it were me i would shop the cobra guys and try and find a uses 2.3l whipple or a 2.2 kb for the tork tech kit.
A centri blower like all have said will be cheaper than getting an eaton. And would really be the preferred route as far as reliability, and power gains. If you are truly set on an Eaton check out Torktech. They have some decent kits already put together for the swap.