That was going to be my question. First, make sure there is no hot water flow through the system. It should not be necessary to E&R the system based on your pressures. Charge it until the bubbles in the SG are almost gone, then add another 6 ounces, and you should be good to go. I did this several weeks ago on my '83 300 and used a recovery machine(for its scale) and added 7 ounces of R12 that I had previously recovered. First attention in 4 years, I can't complain about that. I got to 38* on the center vents in 90* temps with a dew point of 72.
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