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The bottom end of these motors are B-U-L-L-E-T P-R-O-O-F
Literally. The most ever needed is a top end rebuild (head, valve stem seals, etc). Putting in a new long block is a complete waste of money IMO. If you have someone else do the top end rebuild, it will run you $1500 MAX. Do it yourself and it will probably only be $300-500.
Are you sure your running problems arent caused by the CIS-E being out of tune? There are many critical components that can fail making the engine run like dog *****. Just my .02.
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