Manuel,
dry sleeving the cylinders is OK, do it and move ahead. The dry sleeved cylinders will be stronger than those that aren't sleeved.
Wet sleeves, those that are brazed in, are problematic, I advise against them. But dry sleeves are fine. In the good ol' days, Cleveland racers would dry sleeve all 8 cylinders to eliminate the possibility of a cylinder wall cracking.
John K, in Australia, they had 302C's as well as 351C's. The difference was 3" stroke crankshaft & a 6" long con rod. The blocks were identicle.
Bill, what has your engine guy been smoking?
your friend on the DTBB
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