Chevy is much cheaper. You can make twice as much power with chevy for the same money. I love ponchos but they cost too much money to build. They do make massive torque nothing will move a big car like a big cube poncho.
But that being said dont build it buy it. Butler is the master and his engines are built right and cheaper than you can do it yourself. A lot cheaper.
Butler Performance - Specializing in Pontiac Engines Heads and Performance Parts