I've got a stock but boxed model a frame under my 27 and it works well, but in hindsight I could have put a repro frame under it for the same money I have in it with a whole lot less work. Model a repro frames are very reasonable compared to the 32 versions and you can get them with various rear crossmembers to use anything from buggy spring to coilovers and more.

Post some pictures of your car, it will help us help you figure out the best way to build this one.

Don