I'm with Roger, leave the race car parts on the race car! A '55 has a ton of room for all the front end accessories and essentials, no real reason to go electric pump, electric fan, etc. Yes, they do take less horsepower to run but they also require a lot of amperage out of your electrical system so the minimal gain in hp is given away but having the alternator charging almost constantly and eating up that minimal hp!

Street cars are going to be driven, not raced 1/4 mile at a time. At the drags the electric pump and fan are used for quick cool down between rounds which isn't necessary on the street. Stick with the stuff that can be easily replaced at most any parts store. This from the guy who had an electric pump go fubar 95 miles from home on a Saturday afternoon!

The Stewart stage 1 pump is a very good pump, also Weiand and a number of other companies make a really first rate hi-volume mechanical water pump.