As far as the fuel pump goes, it would depend on if you were having any fuel starvation problems. The standard pump flows a reasonable amount, so i doubt it would be a problem for a single carb setup.
As for the dizzy, electronic is always better, but you might not have to change/shave the points as much as i used to.
I don't know how much i would spend on a single cam 2t/3t motor though, not with all the tasty conversions floating around