There are precious few useful parts in one of these engines after a blow up! I had similar issues, I had to strip 3 engines to find enough usable parts to do a rebuild. Fortunately one was a crash damaged engine and still had a good crank.
I had lot of trouble getting main bearing clearances right. I bought 3 sets of main bearings (2xACL std and 1xACL 0.001 undersize) and with a lot of careful measuring I mix-and-matched a set that had the correct clearances.
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