ok it runs good till it hit third gear at about 3 grand it starts to stave for gas im pretty sure the fuel pump cant keep up and so i need a bigger one i have a 454 with a 770 holly double pumper that all i know or was told when i bought it i was thinking of going to a electic fuel pump but idk yet give me some idea where to get one at and should i go to electic?

Sounds like you're wanting an electric pump. Just remember that a factory, record holding, LS-6 used a mechanical pump.......................