That is an HP manifold. The 70-71 has the heat stove, and it does not run to the #1 cyl on an HP, it does on a log manifold. I can see that it pretty well in that pic.
I've had 1 TNT and 2 E85 cars, and IMO the TNT pulls noticeably harder in top end and revs higher. The 350hp version has the same cam as the 383 2-barrel.
thanks. i was pretty sure it was HP manifold, but i never paid close attention to placement of the "heat stove".
i don't work on cars beyond the routine stuff ..oil changes, fuses, and such. BUT, my mechanical ignorance aside, 25 HP feels like MORE than that in a E86 car vs an E85 car, when i thought I really shouldnt be able to feel it.
I guess comparing torque/HP curves would show "where" (RPM) power gets delivered can help me understand the "feeling" I can discern
So I agree with you and others who noted this in other threads -- these U/L code C's are STRONG runnin' cars. something that big, weighs that much .. i called 'em NFL o-linemen, 350 lbs with outside line backer speed - freaks of nature.
Anyway, based on your observation on others, and looking at my own cars, yes I feel confident this IS a TNT car - as I did when I first saw it. which was part of why sauterd posted it in the first place.
My gut says that mileage could be accurate. The drivers doorpanel, armrest pad, battery cable ends and some other things are too good for 140k. Is it pristine around the detailed edges? No, but those 40k could've been put on when the car was newer, and not considered as collectible. And that dashpad thing could be due to age and sunlight, not mileage. I had 2 cars with ~80-90k miles that had that same spotting at the corners.
IMO that's maybe a $15k car as not desirable color combo, and needs more detailing/polishing to go higher. But hard to get near $20 even if all perfect, I don't see many on ebay actually selling near that price point.
yeah, it MIGHT be a 40K mile car. I'd need eyes on it and pieces of paper to help me conclude one way or another IF i were a buyer ready to invest time/money in due diligence it. there's too much conflicting data to really tell.
I agree with your price assessment that its likely a 5 digit car, but would be challenged to have the first digit a "2" even if in perfect shape. i just wish it were marketed more comprehensively (pics and papers).
But, as is, even to get to 5 digits, I'd need what seller hasnt provided yet, and may not ever provide, if I was a buyer. Heck, who knows, as we opine on it, somebody is standing in front of it with a wad of cash

. I wish him good luck ..seriously.
I just hope it finds a new caretaker -- at whatever price/to wherever it goes.