new motor blues

Not likely to be a coil or control box if the problem is local to a single cylinder. Since you have good compression I seriously doubt the head gasket is leaking. The ONLY exception to the above would be a water leak into the cylinder. This will cause a lot of steam out the tailpipe, stopping almost instantly if the radiator cap is removed. Generally the cylinder will still fire with this problem, unless the leak is severe.

Use a timing light to verify all spark plugs are firing. If you have spark, and you have compression, it must be a fuel issue. You can rule out the carb since the problem is local to one cylinder. At this point I would suspect a vacuum leak local to that cylinder. An intake gasket leaking to the lifter valley or severely cracked intake or loose valve guide would be about the only thing I can think of which would cause that.

Copper spray adhesive is generally only used on metal faced head gaskets. If you used a composition gasket, especially a Fel-Pro blue, it is not needed.