Look what I found on Ebay. Might save someone alot of work. I have seen some guys on here doing some transplants. Eventually I plan on swaping a Gen3 motor into my mustang.

http://cgi.ebay.com/ebaymotors/LS1-L...QQcmdZViewItem

 

decent price too

 

transdapt has them and they cost about the same.

 

I saw some one that came with like a ~2 inch adjustment, so you could actually slide the motor fowards and backwards a couple of inches. I can't seem to find them again. That way you could get the motor position right up next to the firewall. If anyone has seen these please post a link for me.