The last time my father ordered ashort block for his 88, I believe they didn't have an 88 block and sent him a S88 short block, but I don,t remember for sure. 

The numbers on the left rear of the block are 190320 with K1000 underneath that. The numbers on the right front of the block are 620 50 N. Any body got an idea if it's an 88 or a super? Thanks.