Re: a/c vacuum removal
One of the vacuum lines shuts off hot water from the water pump to the heater core. You don't want hot water going through the heater core while running your AC. But, you also don't want to eliminate the heater hose entirely, otherwise you wont have heat. The valve is vacuum operated. Get one and install it in the heater hose. Then run a vacuum line from the intake to the valve. Depending on whether you want heat or AC, just disconnect the vacuum line from the intake and the valve will open or close accordingly. (If you do this, don't forget to block the intake vacuum port.)
Another vacuum line opens and closes a valve that is located under the cowl panel on the p/s. It determines whether you have outside air in the system or inside air. (For example, for max AC and max heat, you want inside air.) You can close the valve in which ever direction gives you that option, and jury-rig some way of keeping it that way.
Honestly, the best way to get what you want is to replace the missing stuff with the right stuff. It's not very expensive. You've already got all the expensive stuff, like the AC compressor, evaporator core, dryer, condensor, etc, etc.
There's a good chance you still have that valve under the cowl panel, the vacuum canister under the d/s front fender, and the hot water shut off valve. Someone just got lazy and didn't hook it all up. Another plus is that even if you are missing a couple of these items, you've already got the mounting holes threaded and firewall holes punched.
It may seem complicated but refer to the assembly manual for pictures. The guys on here will also provide you with pictures and explanations.