I believe one of the advantages of using the long pump is that the alternator can be mounted in front of a cylinder head making the overall package narrower, with the short pump the alternator is too long to fit in that area. I need to review the difference between the short and long pumps again.
I located the original engine accessory bracket for the 91 engine (still has the A/C compressor installed) and it does include the mounting points for a tensioner and I believe the alternator. I am not planning on having A/C and not sure if I can just delete the compressor or will need to add an idler pulley in that location to get the required wrap on a serpentine belt.
On my Jeep conversion with the short pump the alternator was mounted high on the passenger side and the power steering pump was mounted low on the driver's side. I had a two groove crankshaft pulley with one belt running the water pump and alternator and a second belt running the power steering. I could envision a similar setup for this truck. the Jeep also had an electric fan mounted to a home made shroud such that it pulled air through the entire radiator surface. I believe I had about 1/2" clearance between the back of the electric fan and the water pump pulley.
