Trying to figure out what this engine came out of before it was put into my 81 elky. block number is 14010207 with a 43GM stamp on it. head number 3998993. the most I can seem to find is that it was an 80-85 2 or 4 bolt. Some info I found said it was a Target Master engine but can't find anything beyond that. Can't find any info on what a Target Master was. No idea on what any specs are on this engine, cam, cr,etc. Can anyone help me? I added pics of some of the casting numbers i found on the block and head just in case i'm reading them wrong. Any help would be appreciated.