Heres how I would do it, if I were a promoter.

Hot Lap Sprints
Hot Lap Mods
Qualify Sprints
Hot Lap SS
Hot Lap Bombers
USAC Heats
UMP MOD Heats
USAC CONSIS
SUPER STOCK HEATS
USAC FEATURE
BOMBER HEATS
CONSIS FOR MODS, SS, BOMBERS
THEN FEATURES

Simple