An A has an overhead valve engine...so there's no side plate to remove to get to the valves.
My recommendation would be to remove the valve cover on the top of the engine, and rotate the engine until the #1 exhaust valve opens. That way, you know you won't hit the top of a piston. Then take a ball-pein hammer and gently tap on the intake valve, after spraying the valve stem area with a penetrating oil. Don't KILL it, just tap gently. If the spring isn't broken, and if it still has SOME springiness left in it, taking the valve past the point where the rocker stops will sometime cause the spring to "do its job" and return the valve to a closed position.
The problem comes in when the valve has already hit the piston and the valve stem has bent. THAT valve ain't coming "home," and you'll have to remove the head and replace the valve to fix it. But until you remove the valve cover, you'll never know what's going on there.
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