Does anyone know what part number heads should be on an original 383 2 bbl engine? I'd like to swap cams at some point, but I would think I should do some work on the heads. I'd assume that the stock heads aren't the best for a larger cam, as the motor is a low compression 383. Would you guys recommend using "906" heads instead of the stock 2bbl heads? I have a set laying around on a blown motor. If the top end on that motor is good, I suppose I should use those heads.

Thanks.