I have a 1979 Regal w/ Stock Pontiac 301...
I have a 2bbl Rochester M2MC Carb (DualJet)It is said that this carb is the same as the Quadrajet..My question is would a Quadrajet fit in the stock manifold?? would I be able to upgrade???to a 4 BBL??

2bbl and 4bbl manifolds are different. You would need to get a 4bbl manifold to convert to 4 bbl.