This is going to sound harsher than intended, but ... from younger days I already have owned a couple of Trans-Ams, Corvettes, a factory 455 cubic inch Buick GS Stage 1, 69 Camaro with a L-88 engine swap, big block El Caminos, etc, all big blocks at least 400 CID and they are all crap compared to what you can get for about $30K now in a new (or much less used) Mustang, Camaro, or Challenger. The old cars weren't that fun to drive because no matter how much power the engines made (and it wasn't as much as everyone 'remembers'), the suspensions could not put the power to the road. If you really want to enjoy a ride, go buy a 2015 Mustang GT which will outrun any old muscle car and do it with full emissions equipment, safety equipment and air conditioning. By the way, if you want 500 HP, don't try it with a Pontiac 455 -- that long stroke motor was a POS -- if you have to do it the hard way with 1960's/70's tech, go with a 427/454 Chevrolet, even then the factory race engines(427-L88 and 427-ZL1) were only making about 550 horses with open headers. Oh and those mid-70's Trans-Ams couldn't take all that much horsepower anyway -- their crappy bodies with the partial subframes twisted all up under real torque, especially the T-Top cars. I was a huge muscle car guy and went through the 70's when "government regulations" killed the muscle car, but the cars now are supercars compared to the best from back then and you don't get a lungful of lead, hydrocarbons and CO from behind them. I'm convinced that this would not be the case had the government not forced the automakers to clean up. If cars can be this good and this clean now then there is no excuse for anything else to be dirty either.