Am I getting what I'm paying for?

Howdy from Texas,
I want to start by apologizing if this question has been asked before, I don’t have the time to scour the forum for an answer and I need one FAST.
I am looking at buying a 1979 F250 Highboy Supercab.
The seller (who is a truck outfitter, but is NOT an engine mechanic) took the truck in trade from a customer.

The customer said the original engine was replaced “recently” with a 429 Cobra Super Jet and only has 1500 miles on the rebuilt engine. The engine’s serial number is:
D1VE-6015-A2B

I know next to nothing about this type of engine, but a basic internet search has the engine serial number coming back as:
D1: 1971
V: Lincoln
E: Engine

What suggestions do ya’ll have for me? How do I confirm or deny the engine is what he says it is?

I have looked at every Ford “Part Number” chart and reference I could find online. Any help would be appreciated.

Look for the head casting number just below the valve cover ( which should be finned aluminum) for DOOE-R . That will tell you you at least have CJ/SCJ heads.

gt350hr wrote:   Look for the head casting number just below the valve cover ( which should be finned aluminum) for DOOE-R . That will tell you you at least have CJ/SCJ heads.

I appreciate the help!!

gt350hr wrote:   Look for the head casting number just below the valve cover ( which should be finned aluminum) for DOOE-R . That will tell you you at least have CJ/SCJ heads.

Is this what you are referring too?

Bill wrote:

gt350hr wrote:   Look for the head casting number just below the valve cover ( which should be finned aluminum) for DOOE-R . That will tell you you at least have CJ/SCJ heads.

Is this what you are referring too?

No, The Head Casting # is not on a decal..
It is similar to the numbers in the lower photo, cast on the head...

Look above the exhaust port for the cylinder head casting #