I posted back in April asking for opinions on restoring the A/C on my barnfind 82 300D. I went with the general concensus which was "replace almost everything".

What I Did:
New CompressorWorks R-4 from Autozone (added 1oz mineral oil and rotated about 30 times)
New OEM expansion valve
New Behr receiver/dryer
Flushed all lines with 3 cans of flushing solution (no traces of metal came out)
3 oz of 525w mineral oil in suction line
2 oz of mineral oil and 2 oz of FrigiQuiet in RD
New O-rings w/ Nylog

Pressure tested system with 80psi dry air (held for 2 hours with no needle movement)
Ran vacuum pump for 12 hours (down to 275 microns on Robinair thermistor gauge)

Filled system with 3.5 cans of R-12 (underhood sticker called for 2.6 lbs)
Nice cold air at the vents and a quiet compressor

What Happened Next:
Drove about 10 miles at 9:00AM right after filling the system.
No problems noticed .......Job done, right?
Wrong.

Drove about 10 miles in 95 degree heat that afternoon and got stuck in traffic..... A/C not able to keep up with the blazing sun and ambient temps.
The compressor seemed to be putting a heavy load on the engine.
At the next traffic light, the engine stalled. I turned the A/C off and restarted.
Didn't turn the A/C on until underway... still not cooling so well.
When I slowed to turn into the driveway, I heard a creaking/scraping sound ....it was coming from the compressor.
After a 6 hour cool-down, I checked pressures:
90 psig static pressure
35-40 psig suction and 200 psig discharge while running (I only ran it for about a minute because the compressor was still making noise).

So what did I do wrong?
Too much oil (8 oz total)?
Too much refrigerant?
.....or was the shiny new compressor a dud?
I'm completely bummed-out ..... I've spent weeks assembling all the parts and tried to do everything just right, not to mention all of the money and sweat expended on this job.