Ok, if you're going to rebuild the '72, you have a pretty good basis to start from.
Grab a copy of Hot VWs magazine, and start looking up the advertisers. For a nice project, start looking up what it takes to build a 1776cc or 1835cc engine. Go to the Samba website and start looking up a good used dual carb setup. Dual 40mm Webbers are most common, but a smaller bore size would suit the 1776. If you can find them, dual Dell'Ortos would be best, but they are fairly rare anymore, IIRC. Get yourself an Engel 110 cam, a nice all round grind for that size engine.
Engine building isn't too hard with them, but there are a few tricky gits outside of normal engine work. Get GOOD pushrod tubes and pushrod tube seals. So much of the VW leaking is from those areas. When putting the engine back together use ALL of the stock cooling tin, including the temparature controlled flappers.
Tuning dual carbs requires a Unisyn, but if you do it right to start with, you don't need to constantly fiddle with them. Done right, the dual carbs on a 1776 or 1835 will help produce a strong street bug.
Hobo will have his favorite way of tuning a Bug engine, and could help with the details if asked nicely, I'm sure.
There's more, such as what heads are best, what to do with the valves, the right distributor, etc, but this will get you started in your search.