Well that does not sound like fun! Been dealing with back problems my self and it p*sses me off the most when i cant take a ride across the yard on one of my stiff riding cubs without being laid up for a week. Good luck to ya with the back situation.
Have you done comp. test? When i do a rebuild I will run engine for a while to get nice and warm and retorque head. i did a rebuild on a buddys shovel head last year and he did not bring it back after he took off with it, end of last years riding season here in up-state ny, and his first ride this spring he blew out brand new gasket after just 100 miles.
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John
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