Turbo 383 in a A-body Barracuda

voltage controller for less

http://www.jegs.com/i/Barry+Grant/132/180300/10002/-1

The power step down box varies the voltage to the fuel pump to change putput proportionate to engine. At idle or light throttle, pump voltage is reduced and the loading on the pump and electric motor are reduced. At full throttle acceleration, full voltage is restored and the pump returns to peak output. Power can be manually switched or wired to a wide open throttle switch.