Advice needed on cleaning a motor

[dkooi]

I just bought an unfired ZZ4 that has been sitting in a shop for about 7 years. The intake, water pump and distributor have been off it for just as long. The guy said it sat with a cover on it, however upon further inspection I don't think that's the case. There seems to be quite a bit of metal shavings inside the lifter valley and I would assume also a little down the ports of the heads. The motor was stored near a brake/metal lathe in the back room of his shop, and that's where the shavings came from. How would you guys take care of this problem? Idealy I would like to not go into complete dissassembly of an almost ready to fire motor. Thanks for you input.