We recently purchased a early 50's Chevy School Bus and we can't identify the engine in it. The number behind the distributor is F0719J while the casing number - is 3836848 and the cylinder heads were 3769716. The casing and cylinder numbers may be switched. Any help identify these would be greatly appreciated.

Still At It

48 Thriftmaster
64 Impala
62 Impala

Half the fun is making the mess!!!!!The other half is figuring out now what do I do?????