You guys are great! Thank you for merging my thread with the other one. Attached are some more pics. The stencil looks like maybe “CLD” then something “...inhibited”. And lastly “-1- 63”. Looking at the block and inside of water jackets, this thing has to be NOS. Total diamond in the rough. The intake looks exactly like the Universal Carrier motor in this video
https://youtu.be/l_Wjej1lmWw
11-inch clutch and truck bellhousing. I had a 1950 Ford F1 pickup truck for 20 yrs that got me hooked on Flatheads.