Go with the Pontiac! You can use that same manual transmission you have for the Chevy if you locate a Pontiac bellhousing and flywheel. Or stay with the automatic and beef it up. And if you can locate a 3 x 2 manifold for that 400 you will have a piece of Muscle car history!

3 dueces and a 4 speed....

Turn it on, wind it up, blow it out!

Pat