Serpentine belt question

[Coltonreece]

Currently looking for the correct belt size for a 1993 f250 7.3 idi with the ac compressor pulley conversion and no vacuum pump ( running over top of the vacuum pump )

 

[DougBoy66]

I think you may have to run some rope around where your serpentine belt would go, mark it and measure the length. There will probably be better answers from others on here. I think someone on here ran that by pass of the vacuum pump after installing a hydroboost brake and electric vacuum pump and used the stock belt and the idler still took up the slack