I have a 72 chevelle w/350 and the engine is not orignal. I was told buy the seller that it came out of a 74 Monte Carlo. The engine ID number is T0424CMJ. Can anyone give me details on this engine and tell me what I have.... Thanks

CBUYS

Go to>> www.mortec.com U will find your answer there, Good Luck, L89SEDAN

I find 2 applications that are close to your info.

CMJ=1974 Passenger i.e. Impala etc 350/?hp police w/4bc
CMJ=1975 Chevelle/Monte Carlo 350/145hp, 2BC A.I.R.=Air Injector Reactor. Pollution control equipment

This info from the Chevrolet Parts Catalog No. 11.