I would never buy a built motor. The way it's looking now, it's either going to be getting a blown 400 or a 6.1L Hemi - since I work at a Dodge/Chrysler dealership, I've got extremely easy access to parts, and it wouldn't e too hard to come up with an engine/trans for next to nothing - and since no matter what engine goes in this is going to require lots of fabrication, it doesn't really matter if I decide to go with a Chevy or a Mopar.
I haven't had a chance to do anything at all to it yet, it's been raining every day that I would've had time to mess with it. As soon as it dries up, I'm going to get it sandblasted and in primer so that at least it doesn't rust anymore before I have time to start on the body.
Also, I'm not looking for a drag truck or a trailer/dyno queen. I want something to take out on the weekends and cruise in, and also haul the CRX from time to time. This is going to be less than 500hp, pump gas capable, and completely comfortable/streetable.