100 Octane with 12:5:1 340??

Y2K era,California. Ran a 11.7 to one,Edelbrock headed 340,on 91 with TK7 additive. Good for street driving.Race night,rolled out race gas.(N20). Car had 4:57's, 4800 stall converter. The gear,and high stall,let the engine "float". Deep gears,and good stall,reduce the load on the engine.Efficient? No.Less engine load,less possibilities,of detonation. Not mine,helped with assembly.