What would be a good guess at what the best pressure should be while running?

Go with the one with the greatest spread? I'm thinking I may need to avoid high pressures?

I should have gobs of refrigerant in the system with both a receiver and an accumulator.

I kind of think of the receiver as sort of an extension of the condenser and the accumulator as sort of an extension of the evaporator and my compressor will be real close to the accumulator.

Supposedly the old copper tube/fin evaporators don't flow as well as the new ones so I'm guessing that It'll show up in the accumulator pressures. Will this make it higher or lower? And what will the high side pressures be doing?

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My occupational hazard bein'
my occupation's just not around...
1980 300SD
1980 300SD