Blown headgasket. What's next?

There's still some pretty good cross hatching and not much of a "lip" at the top once the carbon is cleaned off. But the scratches and stains make me think really should overhaul it. But it ran great in the truck and was running pretty good in my dart didn't smoke or use any oil. So i think I'll have the heads cleaned and checked, then put it together and hope for the best. I'll take it kind of easy on her until I build an engine for it later.

So detonation is what I need to be looking out for when its back on the road? What ballpark timing should I be at?