I think the TCI circle track converters are better built than their street versions. In general they have tighter clearances and run more efficiently around the street. But I sure have heard of many failures around here with TCI converters as of late.

For my slightly modified zz502 deuce with 3.50 gear they recommended a circle track converter with 2800 rpm stall. Assumptions were 2800 lb car and ~500+ lb-ft torque from 2,300 rpm on up. I think it cost around $450.

Kitz