I'm going to rebuild my holley 750dp (race) carb the one that has the annular boosters, and no choke plate, did this carb have hi flow PV? if not is a hi flow better to use? where are hi flow PV most often used on?

Found my answer, hi flow = alki carb

Just as a note, Quick Fuel uses the hi-flow pv's in their street (gasoline) carbs.
I asked them if I could use a standard pv in my QF Super Street carb that I bought from them and they highly recommended me to stick with the hi-flow pv's in their carb. They said that they were desinged to use the hi-flow pv's and QF's price was just $7.
I did test with standard Holley pv's until I found the size that I needed, then I just bought the hi-flow unit from them.
I also have a Promax (gasoline) vacuum secondary carb that came from Ben with a hi-flow pv.