73 340 Compression Test interpretation help

No PCV Valve?!? THERE'S YOUR PROBLEM!!! Or at least some of it.

Really, add one pronto. Less smoke, way less oil leaks, only costs 20 bucks.

A little SeaFoam therapy should free stuck rings, but it won't help worn guides. Here's how: Buy 2 bottles, put 1 in a FULL tank of gas. Pour 1/2 of the second into the crankcase. Dribble the remaining 1/2 bottle evenly between the primaries, ultimately flooding the engine out with the stuff. Wait at least half an hour, or even better until after dark (I think the label mentions "significant vapors" or something, it'll smoke like hell). This will pretty much launch any deposits/carbon/varnish in your engine. Do an oil change 3-5 running hours after adding to the crankcase, but do so within 2 days. Also don't go past half throttle until you have fresh clean oil/filter.