Engine Identification
 

Hey guys I have searched the forum and still can't find what kind of engine I have so I can get some parts to rebuild. I thought it was a 1975 302 but when I ordered the crankshaft bearings the front main bearing is not wide enough nor is the little lip (tit) on the side like all the others it is in the middle of the bearing. The following below is all of the numbers I can find on the block.

MS590P 12-590P

4L20 E8AB C3B

and on the engine block top covered by the intake these numbers are stamped

F or E KA51393

Do any of these numbers mean anything and if they do can you tell me what is the cubic inch and what make it is.

Thanks in advance for the information,

What vehicle is the engine in?