Having had 2 E85s and 1 E86, my assessment matches what some other folks have said - at higher RPM the E86 pulls away. And while I am not a super-tuner, I think I can say that all 3 were strong-running vs the benchmark.
Interestingly, my white Fury avatar has a 69 K-code, and when it got 2-1/2" X-pipe exhaust and Hedman shorties, it seemed stronger than my stock E86.
But when the E86 got similar exhaust (albeit with HP manifolds) the tables tipped back again.
The roof looks very suspect to me. It's rusting from the inside.
I have similar rust scale on my TX9 and the '73 NYB I scrapped. As long as it's not perforated I think it's treatable.
I don't think Rusty's talking about the green arrow, I think he's talking about what's in red. That bottom piece of trim is metal in 1970, and it's rusting away, there is material missing. The exterior of the roof looks OK due to no VT, but I'd bet that the structure
under the Dutchman has rust. A 70 300 I had was OK on the outside, but the laminations of metal for the rear window channel were puckered, and the under-dutchman had some rust-thru. You couldn't see it unless you were lying on your back inside the trunk where the spare tire would be.
IMO, this was a $4-5000 car due to lots of unknowns and obviously needing lots of $$ to restore.
We cannot tell whether it has good bones, or whether it merely looks like it.
But hopefully it will survive and be in a good home. Would look striking in a dark reddish color.