I have to argue in favor of the 351c everyone says the 351c is just to small for that car but my 73 q code came gets around no problem and only weighs 4100 pounds without me in it, the 351c will move these cars around fine how fast do you want to go? BTW a heavy car is Lincoln thats why the all came with 460's because they weigh almost 6000 pounds I would say a 351c is just fine for a driver and you can make them to get up and go no problem