Extreme Newbi Needs help

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

I don't know what the 6015 and A2B are......

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.

Posting the same question multiple times won’t get it answered any faster!!!!

D1VE block is a standard 429/460 block. The 6015 number denotes it as an engine part.
The cylinder heads for CJ/SCJ engines will be D00E-R casting just above the exhaust ports next to the valve cover rail.
Standard cylinder heads will be  either C8VE, C9VE, D0VE, or D3VE which are 1968, 1969, 1970, and 1973 respectively.