after a boil out and flush, the radiator shop found 18 tubes still plugged upon removing an end tank.
they rodded it and put it back together. i'm happy to say that Ol'Blue's temperature doesn't wiaver past 2 needle widths below 1/2 range no matter how hard i flog him.
i didn't have them plug the hole, as i never had a problem before and i didn't want to add another variable to the mix.
thanks for your replies guys, i appreciate it.
if you ever get out to northern NY, check us out at www.rok-freekz.com