Mike, have a look at Vintage Air. I thought I was going to have to replace my CAV unit when the circuit board had a relay go bad. Jean at CAV was eventually able to source a replacement but before he found one, I was able to replace the just relay for less than $2. He's always been really helpful even though my car was built well before his tenure.
Before I figured all that out, I started shopping around and Vintage Air had a local dealer and they offered a smaller unit for street rods that looked pretty good. It was compact and would fit in several locations. As you know the location of the condenser next to the engine is a problem as it has to overcome the heat from the headers and it may be a better to move it forward in front of the radiators or even behind the transmission.
Are you sure your current condenser is not repairable? If it simply has a hole it can be repaired.