Poorly. These system take 2 lbs 14 oz of R12 so just short of 3 cans of R134a should be perfect. The Coronet has just short of 3 cans in it to get similar pressures.
It was probably discussed and I missed it but if the performance of R12 would have got you frosty why did you just obtain R12 and go that route? Recently I have run up on some and was surprised how affordable it was as compared to 10 years ago....