You're in real trouble on this one. The sticky valve indicates you didn't do your homework before trying to wake up an engine after a long sleep. Now it's time to take the cylinder head off and see how many other valves are in almost the same danger, and there's no effective shortcut for doing a valve job. You can waste a lot of time and money trying to free up valve guides with various types of penetrating oil but the success rate of those efforts is pretty dismal. Also, I believe you stated in another post that the engine supposedly has hydraulic valve lifters. That's problem #2- - - -without disassembling and cleaning each lifter, then putting it back in the same hole it came out of, you're probably going to encounter chronic lifter noises for the forseeable future. Just stuffing a used engine that hasn't run in a while into a new home and expecting it to work like brand new isn't a realistic plan.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!