Guess what Bolters?

My beloved flame-throwing 216 has a cracked case, I found a ad that claims this used engine is a 261 cu in. Based on the enclosed pixs of engine casting #'s, and codes, anyone want
to take a stab at ID'n the chevy engine? It's bolted to a sm420, the seller wants $300.00 for the pack. Please advise what the engine #'s tell me. It will ( hopefully) go into my '52 3100.

Many thanks, and sorry for not having the band-width to research this myself! PS, the stamped code behind the dist. reads "f02I9H"
Jim
Attachments
261-2.jpg (138.56 KB, 83 downloads)
261???
261-1.jpg (157.82 KB, 85 downloads)
261??
261-7.jpg (34.6 KB, 85 downloads)
261?