If the crank/cam timing was out much, pistons and valves would be crashing together, and if it was off just a little bit it would still run.
Compression/rings are most likely just fine if the cylinder walls look as good as described.
I'd say you have a fuel problem.
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97 F350 4X4 CC Dually 5spd 24V 913 S300/HT3B Ranch Hand.
Playtoy-Oliver 1655. 12V now , 13mm, S475
Wife's ride-03 Excursion 12V swap in the works.
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