In the old days everybody wanted more pressure and more volume. Sounds like a good idea, doesn't it? Today's thinking is a little different. Mainly people have found out that you don't need the high pressure. You already have the HV pump so if money matters you can use it. People have been running them for 45 years. But in reality now-a-days (and I think this is really a Super Stock development) people have found out that the high pressure of the old days is unnecessary. So I would put a stock pump on it. If you find out after driving it that you need the HV pump (because of excessive clearances or whatever) you could put it on then. But I'm guessing the stock pump would be fine. But since you have the HV pump, if money matters, run it.