If there is nothing actually wrong with the vavle, you can replace the spring cap and keepers with the head still on the engine.  There's an adaptor you can get to hook an air hose to your spark plug hole.  Air pressure will hold the vavle closed and there is a small tool that will compress the spring with cap on top of it.  You just slide the spring and cap in place over the valve, put the keepers in place and take the pressure off the spring.  Put your rockers back on, adjust your valves and your back on the road.

Scott , You said the valve was stuck in the up most postion ? What do you mean ?  The valve is stuck open ?   Can you move the valve in and out with the spring off ?

I think I would be looking for the reason this happened.  
    Lash cap ?   Why are you running lash caps ?

In the past, I have seen several ways this has happened.
 1-- 7,000 rpm valve float.
 2--valve spring retainer worn out letting the keepers pull though.
 3-- broken valve spring
 4--excessive side play of the rocker arm allowing the rocker to miss the valve and hit the edge of the spring retainer flipping a keeper out. broken  shim or clip came off the rocker arm shaft itselve allowing rocker to "move over" hitting the retainer.
 5-- Rocker shaft badly worn ,and if you have a hi-lift cam this makes the rocker arm "jump" sideways due to rocker arm getting into a area where it hasn't been before. This happened to me one time.
 6--  push rod collapsed or bowed up due to # 1 above
 7--  Valve guide moving in and out of the head. Hard to see sometimes
 8-- Valve seat moving in and out in the head. ( Type-4 syndrome)
 9--  Or the engine "ate' something and got caught behind behind the valve for a instance.
 10-- Valve adjuster loosened up and backed out allowing pushrod to "jump out" and jam up things.
        You could do the Zen trick if you want to,but I would really look at the valve closely around the keeper grooves in the stem. old worn out keepers ??      " These are a few of my favorite things"  Is there a song in there somewhere ? :lol:  :lol:

Well I be Dang !!     I was going to mention stock but I desided to see how long it would take before you got your head screwed back on right. There may be hope for you yet :lol:  :lol:

And you wonder where the white hair came from
     Its sort of like running a Day Care Center. For a long time I didn't realize that most of the "Kids"  were deaf and didn't understand the term
"Been There, Done That , Stayed Broke"  .  Its only after puberty that logic and common sense descends apon the lost ones like a great revelation and the realization that the 100 + dollar bills in your billfold always went much faster than that "Critter" under the carport :roll:  :roll:

Hopped up with duel carbs ?     Maybe a week or two in 2-carb rehab will work. You could go also :lol:  :lol: