So I went to see an actual HKS 700T down at Greensky Adventures in Florida. It's a pretty engine and I am very optimistic about the install. It will definitely work one way or another. Placed an order and it should be here in a few weeks. Here are a few pics with my cowling. It's the Classic IV smooth cowling so there is a little more room, but the round cowl should be adaptable as well with a few modifications.
A few pics below. I will keep updates on this thread with pertinent info about weight and balance, fitting of components, engine mount, etc. Preliminary thoughts on these issues looks promising.