AS LONG AS you stay with R-12, the OEM worm-drive clamps work just fine. Give the clamps a good inspection, looking for thread distortion from having been previously over-tightened. If they look good, use them.
The hose you need is "standard barrier", not reduced barrier which is thinner wall. For the compressor discharge use #10 (1/2") and for the suction side #12 (5/8"). Here's a vendor with the stuff you need:
https://coldhose.com/hose-by-foot/st...rier-hose.html
I did exactly this with my '66 GTO back in 2012 and haven't had to add any refrigerant yet, so this is definitely a viable solution.