Reply to "Piston damage found...."

While you're at it, Angelo, change your rod bolts and nuts. You have the std 'football-head' bolts which are prone to fail at higher rpms. Boss bolts have a pentagonal head and while Boss nuts look identical to what you undoubtably have, they are a grade stronger.
Detonation with stock cast pistons bends the ring 'lands' that support the rings, locking them in the pistons and allowing blow-by to mess things up. On high mileage engines, carbon residue builts up around the rings and also restricts ring movement. If you're lucky, a light honing of the block rather than a bore job will clean up any scratches. Honing the bores up to 0.004" oversized will still allow you to run std 4.000" bore forged pistons, since the stronger forged pistons can use more clearance than cast pistons and still seal, due to their higher expansion rate when at operating temp. Tell your engine guy that the common erosion at the very top of the bores does NOT need to be honed out or cut away with a ridge-reamer, since its above the areas the rings touch. Leaving that area alone reduces the amount of bore metal needing to be removed; valuable if the block is already bored to 0.030-oversized. Cylinder wall thickness is marginal in almost all 351-C blocks so the less cut away, the better. The only negative to not removing the ridge at the top of the bore- aside from it not looking pretty- is a very small increase in total combustion chamber volume.
I did this on my present block- in 1991- and it still runs perfectly and makes good power to this day.