I know it's a personal preference, and some say one thing while others say something else, but me personally, I would not bore to .005 clearance with a wiseco on an air cooled engine... I had a 350 once and rebuilt with a wiseco, relieved the bridge, and bored .005 over... It lasted about 30 minutes before the piston seized... I cleaned the piston, put in new rings, and bored it another .002, giving .007 clearance, and never had another problem.... I made sure to let it warm up before running it hard to reduce the risk of piston slap, but that was it..... Just keep in mind that the larger of a piston you put in, the amount of expansion will be more because there is more mass....
You also need to measure the entire bore with a bore guage before finding a stock size piston... If it is a worn out stock piston, I would be willing to bet that the bore is worn uneven... It needs to be measured at different points up and down the bore to verify this... If it is, your new piston won't last long either....
Hoodlum