how do i talk the mother inlaw into leting my fiance buy this? lol

Don't spend money you don't have. It is so easy to borrow money and then you can never get it paid off. This can be a very hard lesson to learn and one I am still teaching my wife!

It does look like a nice car for a fair price.

For what it's worth. What I would do is when I see a muscle with a for sale sign I'll stop and check it out if my wife is with me. Usually I can point out something wrong like rust or poor paint or anything before we stop. She gets to see the asking price is five to ten times what a decent slant six A-body is - kinda puts things in perspective.