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Firewall tag and engine code, please help

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Can Someone Please Help Decode This And Tell Me What I Have

Hello all, I am trying to decode the numbers on my firewall tags, they are

12 Detriot Michigan
ST 65 13837 Body BF 3536
TR 714 E Paint KKA
ACC A49 B70 15381

I know the engine is not original because it has a 454 in it, but the engine numbers are
GM T12
3999289 and on the other side of the fly wheel area it looks like ( L 4 either 78 or 73
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3999289 1972-78 454 215, 235, 240, 270HP respectfully, 2 bolt, car & truck
Actually the 289 was made in 70 as well, don't know where their data comes from. I built one for a friend a few months ago dated A 70 so It has to be. The front pad data will tell you what it was originally.
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LOL. Dave, you can make any 454 run like a raped ape, that data just tells you how it left the factory. good luck with your new toy. JN
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