So the lower radiator hose on my 1984 3800sc has been a beech to get in, I have tried many combinations and I finally got 2 hoses that fit together and work, but the hoses only clear the ac compressor pulley belt by like half inch to an inch. Will this be enough clearance to prevent rubbing on the pulley, or should I go searching for another hose?
Should be plenty of room there should be no movement in the coolant hose or the pulley/belt. I think mine is about half an inch from the belt and have had no problems yet. About 400 miles since the swap. If your hose has some flex for some reason you can just put a strap or good quality zip tie on for peace of mind.
Mine was also too close for comfort. Noticed one very small mark where the AC pulley brushed it maybe once or twice, but not continually. I used a tie strap to hold it about 3/4" from the pulley. I'd like it to be further away, but there just isn't any more room. The tie strap will keep the hose from potentially coming in contact with the pulley on hard road bumps.
I have used metal straps to hold my coolant hose away from a spinning pully and belt. If you're really concerned about it, take a thin sheet of aluminum and bend it into a piece of "armor" for the hose. It can be held in place with straps or zip ties. As long as there is no movement, the ties (or shield) shouldn't damage the hose.