You havent said what motor you have in this car.Regulators do exactly that, regulate fuel pressure. Electric pumps put out way more pressure than what a caburetor needs, so the regulator will tone down the pressure. Most regulators are adjustable ,which also means you will need a fuel pressure gauge to see what pressure you need. There may be an electric pump that does not need a regulator but I dont know of one. Most all electric pumps should have a regulator because you need to run 4-7 lbs of pressure for a carb, no higher. To be exact, running 4-5 is all you need for street driving.
There are tons of companies that make electric pumps and I would only go with the name brands, Holley, Magnafuel, Carter...........best thing is to check out Jegs or Summits websites.
I don't know why you just dont use a regular diaphram pump that attaches to the motor. You dont need a regulator for one of them.