While I have the 455 down to the bare block, are there any oiling mods advised for some spirited driving?

 

Milan runs a drill through the oil galleries, but I wouldn't recommend it for a novice (no offense/don't know your skillset). I wouldn't, but I don't build engines.
You'll see a bunch of stuff, but none are really necessary. Some put restrictors on the cam feeds off the mains, some restrict lifter bores, and OPP has some crazy spider contraption. Or, maybe that's in the Mondildo book. Run good oil, a good filter, and change it regularly.

 

Proper clearances, a good pump, restricted pushrods and you’ll be fine.