AC upgrade on 73 Sport

The reason i used a 90 Ramcharger condenser was, size, it was the tube type and was about 1/3 larger than the actual condenser that came on car, Air at vents on R22 systems comes out of vent at 40 degrees , but using same size condenser and a piston type compressor you get 48 degrees when r22 is replaced with 134a, but with larger condenser and rotary compressor, and correct size hoses i get 42 degrees, i only drive the car on special weekends to car shows. As far as mismatch all my parts are for a 90 ramcharger including compressor, lot less space to cool in a Duster than a Ramcharger, and Napa was good enough to look up the correct hose size for evaporator,only difference ,the evaporator on the 90 ramcharger was 2 inches taller than the 74 duster, and wouldn't fit the airbox, so i had to use a 74 evaporator .