I have the "Old Air" Hurricane system in my 54 truck. As far as cooling, it is a good as any on the market. There are 3 fan speeds which let you cool the cab down quickly, and on the lowest fan setting you can maintain your "cool" and still carry on a conversation. Not so with some brands.
My kit was complete, the condensor and evaporator mounts required only drilling a few 1/4 and 1/8" screw holes and there was no need to do any panel cutting or fitting. The compressor bracket was slotted for easy belt alignment and also included a bracket to mount the alternator above the low-mount compressor. All of the heavy line hookups can be done from over the pass side fender.....no crunching up under the dash. The plenium that mounts under the dash is plastic but it's tough as nails....the fit was great and I used screws and fender washers so I can quickly pop it off if I need to access the areas up under the dash.
That's all the good stuff! Now for some other things to consider. I used a 2 groove harmonic balancer from Buffalo and fabricated a pass side mount for my alternator. If you're running Fentons you might have some interference problems with the alt. mount above the compressor. It would be good to ask the Old Air tech folks if this would be an issue. Secondly, the provided large line from compressor to the evaporator is sized to run across the firewall to the evaporator. If you wanted to hide it by running it down under and across the front crossmember you'd have to spring for an appreciably longer hose. Third and finally, the lines both connect to the evaporator on the engine side of the firewall......easy access but visually, you've got some esthetic issues if you want to keep everything visually "clean". It was a trade-off I was willing to make.
I've got a few pictures of the install in my Webshots "Tips and Tricks" album that might be of interest. I did add a pusher fan in front of the condensor but haven't had to use it...even in traffic....probably because I'm running a 6 blade fan.
If you have any questions about the install shoot me a direct email...the address is in my profile and as always, I'll be glad to share what I've learned.
Dave