Gregg,Nice idea, I have been trying to figure out how to run a vacuum pump. I have a Ford PSD vacuum pump lying around that just might wirk like the one in your picture. I can't fit a typical Cummins vacuum pump due to the engine mounts.
I remember your pump setup, I took a long look at using a Dodge pump but like I said it pushes my P/S pump back in the way of where the left engine mount will bolt up at. I even went so far as to remove the vacuum/P.S. pump combo from my Dodge and bolt it up to the 4bt. So I thought I could use the PSD pump I have lying around. I also checked into hydro boost brakes but it is rather pricey.Gregg,
That is not how my vacuum pump is set up. I am using this picture for a reference for the pulley on the fan drive. My vacuum system is off the dodge ram. It looks just like the picture below. I just moved my alternator where the vacuum pump is. I didn't have enough belt touching my alternator to make it work without squealing.