I am almost complete with my LT1 4L60E swap. The Passenger side motor mount I replaced with one of a carb. 350. The only problem is you have to remove the Air Conditioning compressor to do this. I bought a bypass pulley to run the werp belt for about 40 bucks. There is not enough clearance for the Alt or power steering pump so I had to modify the passenger inner fender. I made a pocket in the drivers one to house the computer. If you are not quite as cheap as me you can buy a relocated computer harness to put it in the cab. My swap included a Camaro stub and I used the Trans crossmember out of a mid 70's 4x4 chevy pickup. A little trimming and a couple spacers and drill 4 holes and it works great inside the framerail.
CJ
1954 Chevy 1 Ton Panel