System is either full of air, or your condenser is not doing the job.

How way it evacuated?

Any other repairs? Why was it recharged?

What is the ambient temperature?

Are those pressures at idle or 1800 rpm?

You are undercharged.

Charge 100% of the R12 charge.

The poor vacuum does not help. Not so much moisture, but remaining non-condensable gasses will raise head pressure.

If a 100% charge still leaves the evaporator warm in one place, you may have a defective evaporator.

90 psi on the low side port sounds like a stuck (or badly misadjusted) POA valve.

Here is a video of testing the POA:

https://www.youtube.com/watch?time_continue=68&v=PhWW7hD9-Yw&feature=emb_logo

Do it right, do it once.

Or do it over & over.

When the compressor fails, the shards will block a few passages in the condenser. Then the performance with the new compressor will be poor...

I have no idea what sort of core they provided. A large, folded fin plate style evaporator like this was common for cars that size:


https://www.rockauto.com/en/moreinfo.php?pk=814196&cc=1445060&jsn=917

15 psi 134a is around 15f. If your lines in & out of the evaporator are cold enough to freeze atmospheric moisture, then the core is that cold as well. If you are blowing air over an evaporator that is that cold it will be very cold on the discharge side. Well, at least until the core freezes so...

Your evaporator core is cold as hell. Your vent air is not going over it.

A cold accumulator with 74f discharge air indicates some blend air entry.

Book vs underhood sticker - sticker wins. Jeep tends to change systems mid year.

Your high side is in line with a proper charge with that ambient.

A restricted OT could certainly cause problems, but this could be re-heating as well. Is the accumulator cold?