Re: Few Albacore questions
I'll hazard some guesses, the photos aren't all that clear, so..
yeah, that's a standard gooseneck slide on your boom, it goes into the mast below the slot.
The gooseneck pin is supposed to go thru the mainsail tack grommet. If it doesn't , tie it as close to the sliding pin as you can. For now, don't worry is the luff rope below the slot is in or out of the mast groove, it shouldn't make that much diff.
End of the sail, the line on the clew is the outhaul, it should have a boom-end fitting to tie it to, or to pass it through on the way back to some cleat farther forward. No cleat? then just tie outhaul to whatever you have at the end of the boom, get decent tension so your main isn't too baggy.
How high off the deck shoud the boom be? Hoist the sail up all the way, that's the height the boom should be. Then pull downward on the gooseneck slide and use a downhaul line to tie it down to something (cleat??) so you get decent luff tension.
Loosey-goosey leech? Can't help ya there, it may look better when you get wind in it, make sure you have all your battens in. If still bad, you have to go see your sailmaker.
Good luck. the Albacore's a nice little classic boat that sails real well.
At the clew is the outhaul