Hey Kevin -
Have you seen SVOboy's VX - into -CRX engine swap info?
http://www.crxmpg.com/crx-d15z1-civi...my-swap-guide/
If you're going to be tackling a swap, that's unquestionably the way to go. The mileage potential is startlingly good, and you don't have to be an extreme hypermiler to achieve it. Just monitor lean burn and take it easy with the right foot.
Anyway, welcome to the forum.