Thanks for the education and information everyone! It looks like we have a winner winner. I crawled under the car best I could and peeked around the headers. It is definitely a Mopar Megablock.

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1966 Plymouth Belvedere
520" RB w/ Indy 440-1 Heads
FiTech Fuel Injection
TKO 600 conversion

[img]https://flic.kr/p/2j1ejsK[/img]