Got up early so I could get it done AND go wheeling.
System was really clean, no residue, but I flushed it anyway. Installed compressor, ester oil, dryer, and exp valve. Pulled a vacuum, checked for leaks, charged it up. Got icy cold with only one 12.5 oz can of R134.
Thanks for the input everybody. I really thought it wasn't going to be very cold.