Barbee -
It costs about the same to rebuild a Mopar flathead 6 as it does a valve in head 6 or 8. My ‘53 Dodge has its original flathead 6 (rebuilt). I’ve owned and worked on a few over the years. As good as it looks, I would strive for originality.
if you get stumped on something, contact me. I am located about 50 miles northwest of San Antonio and I have a shop manual.
Be aware that when you work on the rear brakes, you will need a good wheel puller.
If it is a Fluid Drive, you will have to make sure you have the E-brake working properly or you will get to chase it down hills.
The numbers on the driver side, high up on the block are the numbers it is registered under - unless someone changed the engine and failed to transfer the numbers. Every time I get my truck inspected the guys get a laugh out of that.
Your wiring will probably be old and crumbly. Beware.
