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If the compressor clutch doesn't pull in with the low pressure switch jumped, check the ground wire and bolt:
GM part 15568998.
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Available at White Racing:
TUBE ASM A/C CNDSR
USD $53.72
Part #: 15568998
Shipping Weight: 0.2lbs
5 Units in Stock
Manufactured by: GM
http://www.whiteracingproducts.com/...554839&zenid=6eb613225e066ecf9e372dd554e3c402
Actually, 305 is big enough to have good power. Try swapping a lower (numerically higher) geared rear end. If you have the standard for the times 2:73 and automatic, or something like that, try 3:08 or 3:36. If you have a stick, you should have at least 3:54. Bet it will take off like a jet.Thanks. I bought this truck a few months ago. It had been converted to R134 back in 97. I do have a "pancake" compressor... hopefully the rebuild was good quality and it will last for a while. I am told that they tend to work harder since they are so small. I put good quality synthetic PAG oil in the system so maybe that will help. Drove it to Tallahassee today (about 40 miles from my house) and enjoyed the cool air all the way. Those big compressors are good and also weigh about 40 pounds. So good luck muscling that thing in... you'll definitely get some ice cold air out of it.
Good luck with the motor swap. My little 305 has 113k original miles on it so it is still smooth as silk. Next motor will be bigger and more powerful for sure.