UPDATE !! Ok, went to see the car.....drum roll please...I bought it! The cowl tag supports the VIN as it being a 1970 built in Flint, Michigan. The power train is not numbers matching (didn’t think it would be) the last 4 digits on the block did not match the VIN. The powertrain appears to be out of a 1971, it’s a 454 with TH 400 and 12 bolt posi. It runs great, handles well and goes like a scared rabbit. It was reported to be originally from Texas, underneath is so incredibly clean. Seller says the posi is 2:56, it idles nice at 50 mph and is a little sluggish off the line so I suspect that’s true. Interior has Strato buckets, no console. It has some issues, blower fan not running, ac missing the condenser. It has power windows, all work. The fenders have the “stepped” mounting at the rad support, I think this means they are 1970? Anyway, what I bought was a nice 1970 Monte that I suspect will be hard (or impossible) to prove what it was born as. It looks to have a 1971 454SS powertrain and trim. It runs great and looks great. All this for less than the price of a basic Monte with a 350. Its not a pure bread but then again, l myself am a “mutt”. Thanks everyone for your help.