Freon or 134?

[JMac11]

My 84 K10 has lost it's charge. I was planning a serpintine swap anyway. I have rat holed about 60 oz of R12 back over the years. So I have enough to charge it at least once, if not twice. Which would you do:

New compressor, new hoses, reseal system, flush, vacuum, Charge with freon and hope for another 25 years

or

Sell Freon, New Compressor and parrallel flow condenser/ new hoses. fluch vacuum charge with 134????


I know it cools with R12, is the constant