hi all . i got a chev 292 6cyl engine. with engine casting number 2779888 and under them numbers is GM2. i cant find any info on the engine number as to when the engine was made and what was its out of. it does have a marine manifold. did chev make the 292 for marine work if so did they use a engine number just for marine engines. i cant find any engine numbers that match this engine. thanks john