I've seen a couple of cars done like that and it works. I agree with 349 MagnumRT too, its about using what you have not how much you can spend. Its ALOT cheaper to find a mount that will work than it is to find and hang the correct k-frame. I found out a month or 2 ago that with the 70's style 318 brackets you can use the rubbers from an 88 Supra and it will drop into a 64/65/66 a-body perfect. Didnt cost me a penny to put it in my buddies Dart because I have a blown up Supra engine in the shop and looked at the mounts and . Cheap new discoveries are awesome when they work.
Tim