New to me 1693 Cat - looking for upgrades

Been a minute, long story short, compressor was fine, oil cooler was the culprit. I am currently on my 6th or 7th flush to get the gunk out - finally starting to see the light at the end of the tunnel.

I had a chance this morning after refilling my cooling system to take a look at my A/C system. The bottom core of the grilledenser was rubbed through in a lot of spots. I pulled it out and bypassed the bottom two tubes and it seems to hold great.

Will be picking up some flush and receiver/dryer and a compressor belt and see what happens.

Anyways, my blower motor and fan cage is toast. The motor squeals like a pig and the cage has 1/3 of the bars broken out and doesn't move much air. I haven;t had much luck finding a replacement assembly either.

Any leads on where to get a complete blower assembly? I also need the switch as well (rectangle slot, 3 position On-Off-On switch)...

 

I have yet to be able to find a JWAC for it so I decided to convert to air to air intercooling. Has anyone done this on a W900A? It looks like I could fit an intercooler around the sides of the radiator if I found the right width cooler. Were any newer W900's like this or did they all go over the top? Any other truck that might have an intercooler that would fit?

Option two would be to get the radiator and intercooler out of a newer W900 which would also allow me to step up to a 1400 square in radiator in the process. My lower radiator outlet is centered pointing down - did any newer W900's have this style of outlet?

Lastly, what results should I expect to see? .5 MPG increase? 1 MPG?

100° drop on the pyro? 200°?

 

Got a B model CAC swapped onto the old Clatterpillar. Dropped about 200° on the pyro and pulls a bi harder as I don't have to let off for EGT's. Overall happy with the upgrade, even though the turbo spools a bit slower.

Before adding the CAC I was building 25 pounds of boost. Now it will only make 18 pounds. I realize by cooling the air charge boost will drop, but I didn't expect 7 pounds. Do you think all 7 pounds are just because the air is that much cooler or do I have a boost leak? The charge air system tests good cold, but I have seen a CAC hold perfect when cold but leak like a seive when hot. That, and the turbo seems slightly louder and as said, it spools slower.

Thoughts?