Hey here are some pics of the mock up.

Notes:
1 1/4" between fan nose and radiator. Even with the extended stock type radiator.
3/4" between edges of motor and firewall.
Trans cover just fits on, may have to weld a tiny hump for a little extra clearance.
A couple pics looking at the frame mount booster from the exhaust perspective, look closley and you can see the crossmember thats why I think the exhaust may have to run just under or to the outside of the framerail.??? Not much room to fish the exhaust thru.
A/C compressor bracket needs trimming to fit to even see if the compressor will clear.

http://s532.photobucket.com/albums/ee325/fyrdriver/LS%20Burb/