I've used and ran both of those pumps up
If I was building a new car and needed a pump I would buy the 300 to start with up twocents
You and I both know we will want more power later so why not buy the bigger pump first work grin
My new Drag car has a Magnafuel 500 pump in it, hoping for over 1000 HP N/A luck

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)