A friend of mine is doing the 70 conversion using the AMT 68 and front end from a Monogram 70 Chevelle. Not much adjusting was required to make it fit. The model looks really good. I'd post a picture but for some reason my computer doesn't recognize files on my phone.
His resin is very nice. I have had the opportunity to see the development of some of his masters. Michael researches everything he does thoroughly and his detail and casting work are some of the best I've seen. Michael is working on something right now that will impress a lot of builders.
No, the only thing close for those years is the AMT 65 Olds Dynamic 88. You could mate the 65 Grand Prix roof to a 65 Olds body, but then you would have to modify the grille and taillights to make a Starfire/Jetstar.