Welcome to the Bolt, Ron.
I think I can help with your engine number.
All of the info I am using comes from the Keith Hardy site of "Old Online Chevy Manuals".
http://chevy.tocmp.com/index.htm. GMONIZ already sent you there if you checked out his thread.
Using the resto-pack info for 1950 passenger cars,
http://chevy.tocmp.com/chevyresto/5008.htm I believe you'll find
"H" is the designation for engines built for the 1950 year.
"A" is for passenger car engines.
"D" is a Flint engine plant designation and refers to RPO (regular production option) 317
http://chevy.tocmp.com/chevyresto/5042.htmthe automatic transmission option (Powerglide) for the Deluxe Series 2100 models
http://chevy.tocmp.com/models/1950models.htmI believe this engine was the 235 cu in and was the first year for the 235/Powerglide combo in Chevy passenger cars.
1134808 signifies the 1,134,808 engine built at Flint for that year.
Don't know if you have a 1940 truck or not. Check out the gallery here at the Bolt and find one that looks like yours.
Be sure to post some pictures, everybody here loves old truck pictures.
Hope this helps.