A 250 with 3 pull out racks should handle a 100 halves although that's probably gonna be some tightly packed bird.
Everybody has their own chicken process but for me its right around 275F for 3.0 - 3.5 hours for quarters but I like my bird done to the bone. Halves shouldn't be all that different time wise. I'm sure other folks will toss in some suggestions.
As for a recipe, brush them well in EVOO and sprinkle heavily with your favorite seasonings, they will brown up nicely.