I would not recommend boring out the 240. The cylinder walls a Very skinny as is. Hopwever I seen people bore it out to like 2.440 liters.
Miles on the KA block don't really matter seeing as it is Iron, and pretty much bullet proof from the factory. You will want to replace the crack, pistons, rods, etc. If it's miles are too high. For the reliable High compression engine, everything should be forged.
As for upgraded Cams. PDM makes some and so does Jim Wolf Technologies. Nismo too. (nismo's is just two 91' exhaust cams. one repinned to fit the intake side) I've heard the JWT's are nice because there is almost no low end torque loss and they are made from blanks, whereas you get more HP on the top end with the PDM's, but loss of low end torque, and they are re-grinds.
Depending on how much work you wanna do, you can get around 250 hp out of an NA 240 with about 7-10k from what I hear. That includes EVERYHTING. Sorry I can't be more specific.
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