Dove blocks have been known for core shift among other problems. Why was the block re-sleeved? There are a number of variables that have to be addressed to rule out what the problem is on any motor that consumes excessive
oil. There appears in this instance that there is no question that the
oil on the walls is either excessive or the rings are not doing their job. Of course, as Mike said it could also be a combination of factors and probably is in this case. What was the
oil pressure? Many times excessive side clearances will lower oil pressure. There was a Dove block a few years ago in a Cobra, that was in and out of about every FE shop in Ohio, including an extended stay in a shop in Cincinatti. Is this the same car? What oil pan is being used? Stroke and type of crank? Rod length and type of piston? Lots of questions.
wayne