the 142 is a smaller huffer and will get you there and you may be able to conseal it all under a hood....giving it that sleeper look...Or with a 671 you'll be out of the hood and no way to hide it....but that itself is part of the itimidation proccess!

The 142 will fit under a 4" cowl where as the 671 will NOT

Also the 142 operates with one 4 barrel carb while the other with two....also 500hp with the 142 will be the extent of it's size while the 671 can go way higher with the right parts..