Has anyone used one of the GM "Tow Truck Retrofit" version 502s in a rig yet? It's basically a lower-cost version of the standard 502 crate motor, setup for a LOT less horsepower (peak is something like 330HP), but the torque is massive and starts aroud 1500RPM. Of course, it is described as a towing motor so you'd expect it to perform well in that application....just curious about driveability, impressions and maybe what it's like when there ISN'T a 7500Lb load being pulled behind...???? This is under consideration for the '72 Burb. I can't complain about the 350SBC that has been faithfully pulling my trailer over the Rockies & Sierras so far....but I think it's foolish to expect that it's a "smart" thing to keep doing.