The problem with building a GEMS motor is that oversized pistons are not available. I have had a number of high mileage Rover engines rebuilt. Most likely you will find minimal wear on the cylinders and just rering the engine and turn the crank & recondition the rods. Aluminumv8.com is a good source for parts as is RN & AB. Oversized rod & main bearings are a stockng item. Piston rings & lifters are available aftermarket. Gaskets & seals are easy to get. The camshaft & timing set will be specific for the GEMS motor. D&D Fabrication have a high performance cam for this motor as well. If there is a damaged bore, liners can be replaced. Flanged liners (tophat) are available as well and may allow salvaging blocks that have cracked behind the liners. I say "may" as I am in the process of doing one and will see if it works after I get the car running again. :safari-rig: