BOSS 429 May have been slow in your opinion but I’d still take one. The notchback mustangs never seem to get much respect, I get it I like the fast backs better myself. But I did have a 70 notch back with a 351 Windsor that embarrassed quite a few people over the years. I think the one posted may be a bit over priced, don’t really know any details, they could’ve at least washed it before they took the photo. My only interest would be to make a fast back car out of it and that would be cost prohibitive.‘70 mustang to me is in the same bag as ‘73 and later GMs...ugly and slow.