I'm looking for any help on information about 78-81 malibus with standard transmissions. I met a guy at a local car show that had changed his car from a v6 3spd stick on the floor to a 350 v8 with a muncie 4spd. He said he had to cut the floor to fit the new setup. I'd like to know if i bought an original 4spd car with no drivetrain, could i put in a m21 and a big block without having to cut up the floors? Or possibly a 5 or 6spd? Would the vin # tell me whether it is an original 3spd or 4spd or do i need to look at data plate on the car? Any help would be greatly appreciated. Thanks alot.