In mounting a different motor, watch for hood clearance. I wanted my motor up a bit to help with the oil pan not hitting rocks. I ended up the the top of the motor 0" from the hood, the OEM TB hat actually scuffed the hood inside a bit. I later had to swap out the frame, so I mounted the motor 1/2" lower. Since you have an SYE you can tuck the tail a bit higher, or leave it stock, but I wouldn't go nuts with it. I think the super tummy tuck thing is over rated.
'93 YJ, '02 GM 4.3 Vortec V6, SOA, dual ARB's, 8.8+D30(w/WarnHubs), 4.88 gears, 35" BFG KM2's, AX15, 15x7 wheels, NP231+4:1+SYE+2LO, York OBA, Warn M8000, no top or doors Apr-Oct.
Member and Web guy: New Mexico 4 Wheelers My Truck Page on NM4W Site