....Once again.....I strongly suggest you find a ref and talk to him in person. I think you are putting the cart before the horse. (sort to speak). Plus.....you may buy a huge mess when purchasing someone else's handy work.
Buy something stock and do it yourself.
This is experience talking above and advice I fully agree with.
I had the time to do research when I did my swap. Had a daily driver and did about 2 years of research before making the final decisions. Not suggesting you take 2 years to figure it out - that's just what I did. Buy a stock car in good shape, get it paid for. Then, build it.
My swap ended up a JDM DOHC ZC engine in a domestic 1991 civic hatchback. Plenty to learn and I'm no beginner when it comes to performance builds, etc. But was new to Honda's.
I can tell you CAFROG has done a few swaps as there are threads on this site to bear that out. Not sure about autox 89 dx, but by his advice, he's got some experience somewhere.
Buying a previously swapped ride, you never know what you're getting, and it could be an abortion. It takes experience to know what to look for and even then there is risk in the unknown.
My hatch was owned by some punk that butchered it before I got it - I didn't know - had no clue. I found out later, wiring was AFU, missing parts, missing screws everywhere, body panels, fender liners. It took a couple of years and $ at the dealer parts counter to get it cleaned up. Wiring had some DIY alarm system that was removed before I got the car and a DIY stereo installation that was also removed. Bull$h!t splices under the hood on radiator fans, behind headlights, tail lights - nothing soldered. A phuking mess.
Chances are if it's built, it's been abused - there is no way of knowing outside of word of mouth or if it smokes or knocks. Know way of knowing how long it's going to run.
Buy a stock car, with no rust, that's not been butchered. Research what you want, plan it to include $, buy used engine, build engine, install engine, exhaust, etc.
When you build a Frankenstein, plan on working on it yourself. The best way to do that is to have built it yourself. I wouldn't entertain taking mine in to shop for anything but alignment and a new set of tires - glass replacement and maybe tint, alarm installation and service. They ain't going under the hood - that's my world.
I do know it depends on what side of the bed the ref woke up on too lol. Once, I saw some shady crap wired swap with a oil dripping' block...it had a certification sticker. 
