Will this bore clean up, magnum head content too.

448Scamp said
Sleeve the bad holes and use it. The sleeves will be better than the factory bores.

Certainly one option. Not the most cost effective, but it'll sure work. I'm cleanin up a slant 6 block now gettin it ready to take and get a sleeve put in. How's that for saving something? I'm a glutton for punishment. LOL