TPI are known for having a crapload of torque, and running out of steam by 4500rpm... they're effectionately known by the 3rd gen Camaro guys as "the best truck engine that was never put in a truck"
Neither are very good for performance by today's standards, but the TPI has more potential if you want to stick money into it... but I wouldn't stick much into one of those either... at that point, just go LS.
