Dude, that blows. I would never trust just anybody that I met on the net to do work like that. Even if it was a close friend, unless they were a mechanic, they are not doin anything like swapping an engine on my car. I'll trust my friends with my suspension or exhaust or somethin, but never the engine cuz things can go wrong quick.
Not sure if you have a case here or not, seems like that Matt dude is on Honda-tech preachin the complete opposite story to them so its you word against his. Good luck here and hope everything works out. I'd say try to get the 900 bucks back from him (maybe a grand cuz ur car doesn't have a motor and you did a lotta drivin) and go pay a reputable shop to drop in a nice LS motor or something that will work.