You had better also remember that you know your own motor. You don't know anything about the motor that is being offered to you (or why the other guy doesn't want it).
I would only buy my motor from a reasonably reputable (by eBay feedback) seller, and they backed it up superbly...even mailed me spare parts later at no expense, and believe me....YOU WILL NEED MORE PARTS than what you think. Downpipe. Sensors. Bad parts to replace. Electric fans. New radiator. Tach. Fuel pump. Fuel pressure regulator. Throw in a Fuel pressure gauge for good measure. Power steering lines (if you need it). is the wiring good AND uncut? Their are lottts of headaches to deal with and that is assuming that you know what you are doing. They turn into migraines when you are confused.
I know the thrill and excitement of having the opportunity to get an RB in your car, but be prepared to shell out extra money and endure atleast a month or two of downtime (mostly waiting for parts, assuming you have the cash to order them as soon as you realize that you need them AND they are sourced quickly).
If you are up to the challenge, have the cash to do it right, and don't need this car ready in two days, then GO FOR IT!!!! check out this video:
http://www.youtube.com/watch?v=AXQt3164sJY
(I will edit this if the youtube video above doesn't link)--TJ
Modified by s13_240_rb20 at 11:19 PM 2/25/2008