Gambles is right on about the push rods. Even though I've been twisting wrench's for 30+ years, we all make mistakes. The rocker arms are not adjustable, so I'd lean towards the intake exhaust push rods may be mixed up on a cylinder. Before you tear back down, do a compression check to see if you bent a valve. Just saying from experience (wink) an exhaust valve push rod in an intake position can bend a valve. It may idle just fine to a little rough but when you rev it up it will miss, buck, cough and spit.
The intake would have to really be loose to act the way your describing, because you can't really get the intake cocked one way or the other.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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