To be honest I don't think you're going to find a magic carb to make a bunch of HP and torque appear without other engine mods...I'm not sure what write-up you're reading about the bugspray carb but at one time that was "THE" carb for the average owner to use on modified VW engines and made the most HP out of all others...Most of those holleys are now wore out and create more trouble than their worth with bad throttle shafts etc...Good ones get snapped up even today...I have a book titled "How to modify VW engines" and there's nothing but praise for them...Anyhow, fast forward to today and I'm sure you can find a VW forum and the guys will tell you the price for more HP from one of those engines it's not cheap...