That casting number can be a car or truck block but by looking at the left front of the block the 2 bosses look to be drilled and tapped for truck mounts. What is the stamped. code in front of passenger side cylinder head on the machined flat edge?
I kick myself in the ass as a year or little more ago a guy had an nos 65 remote mirror complete and wanted 1000 for it but I made him a low offer and he countered and I passed and it sold the same night, given same opportunity I would have paid full price and sent him flowers.
63 64 tilt is different and with a factory tach there is a notch in the column, no 63 wood wheel or remote mirror just 64 and up. Remote mirrors are currently bringing insane prices and is one of the few options I would still like to get for my 65 convert. One of my 63's had the tilt with tach.