I have a junkyard 292 that I plan on building into a good motor.  My good friend, a professional thinks the bores are too rusted to salvage.  Mummert can sell me .060, .070, .080, or .090 oversize pistons.  I can't believe I can't clean up the bore with that much oversize.  Of course the machine shop will find out the truth.  Don't want to pour too much money into a lost cause.  Photo attached.  Any opinions out there?