Hey I finally dropped the sr20 in this weekend. What a B!+@H. The engine droped just fine into the engine bay no sweat. It took maybe 5min. But, I was an 2 inches off on both motor mounts. The engine would just not go back far enough. So here is what I ended up doing. I went on
http://www.nissanperformancemag.com/installs/240sr/
http://www.superstreetonline.com/howto/3430/
http://www.srswap.com/faq/index.asp#prepengine
I even got this issue of "Drifting" which was the best!
Anyway they give you the steps about moving the heater hoses from going to the drivers side and point the to the passenger side. You have to do this BEFORE you drop the engine. Because like I said its tight! Well those hoses did not give enough room to push the motor back. So, here is my tip. You have to hoses. #1 hose is an "L" shape that you turn 180 deg. The #2 hose is connected to a hard line that run along the back of the head. Everyone says to arrange the hose so it is on the hard line and going back to the passenger side. But, that hard line is in the way of the head moving far enough into the firewall. So I cut the hard line right at the back of the head. So now on my block I have 2 hard lines coming out at the same length and the are both only a couple of inches from the heater hose outlet from the firewall.
I hope this helps.