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Tech SuperMod!
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What type of fuel do you have access to in your area? 13.5 compression is significantly higher than stock, and contrary to what JE informed me over the phone, even on 93 octane there will be pinging issues especially at lower RPM's that require re-mapping the ignition table.

Overbore is no issue, but realize that tiny changes in thickness of the gasket have a dramatic +/- in compression ratio. Unless you are planning to re-do the ignition table, I would aim for a build that is close to stock 12:1 to 13:1.

Also, another option is to send the block to Millennium Technologies, and have them take a look because they offer a Nikasil restoration service where the ORIGINAL bore size can be maintained so all you would have to do is score a set of OEM pistons, which would be far cheaper.
 
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