is there any disadvantage to running my 110 GPH holley blue back by the tank and still running my stock mech. fuel pump?im running a holley regulator so im not trying to use the pump to regulate pressure,but am i putting a bottle neck in the fuel system by doing this?its mainly because i still drive it on the street quite a bit and would like have a way home in case the pump ever died on me.

It's only 110 GPH freeflow. Under typical 6-7 PSI operating conditions it's less than that. Your mechanical pump suffers from no such limitation and will probably outflow it or at least present no restriction to it.

j/w are all holley blues only 110 gph?what kinda power/rpm can they support?