Found the head casting number, 3836850. The only other number on the block was in front of the fuel pump, and it's maybe 3133850. It's down where these old eyes don't focus. I took pictures but again it's down in amongst everything. Also, the carburator: Rochester, under choke shaft "RP Rochester GM made in USA pat. xxxxx. On base #7005606. Pictures I see of other fellows trucks the carbs are different. Also, more pics of oil filter. It's an M&W Gear Turbo filter and there isn't a number.

http://s1325.photobucket.com/albums...iew&current=DSCF2312_zpsc9ccd0ad.jpg