no high pressure rv2 help!

new dryer. the service manual on the car says nothing about blocking the condensor in my book. it says the high side should be a minimum of 140-180 or 200.what do you mean by the txv. we pulled a vacumm in a heated garage. The car is in a heated garage at all times . I am trying to finish the resto.The compressor I purchased rebuilt has no valve in the low side port . The people I have talked to says its impossible to buy them today. Why does the clutch engage when you push the max a/c button and only run for 10 seconds. off for 10 sec the cycles on -off. I have almost 4 lbs of freon in the system . Initial calls for almost 3 . Thought it was low addes another 1 lb no difference yes on the doors and blower good to go