Big decission: Which conversion kit to buy for my 78 FJ-40's new (not so new) 91 350 TBI engine. One kit from AA (P/N 713024-EK) requires the engine, transmission and transfer case to move forward thus requiring the drive shaft modifications and gear shift lever relocation. It costs $641. The other kit from AA (Marks P/N 713025-EK) doesn't require any modification to the transfer and transmission location. But it cost $1407.