super charged 340 ???

yea i was worried 10 to 1 would be a bit much i do know they do sell thicker head gaskets but i have noi idea how much that will drop it ... i aslo do mix 100 octain with some 91 in my tank of gas. i do have two 8 3/4 pigs 3.91 and a 3.23 both posi so i could switch them out. looking for a pro touring car not a drag car just put 4 disk wilwoods on the car. next a hotchkis suspension