A/C questions on '66 Valiant 100

Never known a drier to be rebuilt. They are welded sealed units. Hopefully it was replaced. The RV2 does pull some HP, but you'll likely never feel the difference between it and a sanden. If the compressor is still good, I would simply get another clutch and keep on keepin on. The RV2 is a good unit. I would stick with it. Changing it out will require another compressor and all of the corresponding bracketry that goes with it. So you'll have the time and expense of all that. I think the clutch will be the best way to go assuming the compressor still works well.