The converter is a ten inch, fairly tight for cruising. I may run the car a few times, but it won't do laps, by any means. It might get a better test of cooling just limping along in a parade, I would think. The car will mainly be a cruiser, go to shows, jump on it on occasion. The main thing is, if I can avoid it, I don't want to run the fluid through the water radiator, yet still keep the trans temp well in the col range. I think the Derale 25 row is going to be my choice, with the 45,000 btu rating. The braided lines will also get the nod, since I want to keep it easy to install.