VWs always want to overheat
there are just a few things you have to know about building a VW engine as far as heat and performance goes.
Compression ratio = Heat
Chrome = Heat
Incomplete Engine Tin = Heat
If you build a N/A engine, it can have a high compression ratio with no worries, but you have to keep the stock compression ratio if you plan to spray or force induction (over 4psi)
People put chrome engine dress-up kits including tins and the fan shroud... this is a big no-no... those pieces are flat black for a reason.
With a side draft turbo setup there is no need to use an intercooler, because even without one the main concern you have is the Intake Manifold FREEZING... The carb sucks air in and mixes it with the fuel, then forces the highly compressed gas mixture into the manifold... the only down side is that you are gonna be lucky to get more than 10-14psi... but my engine can't take 20psi anyway.
I know plenty of guys that run 5-8psi daily with their decklids on and not even offset pinned. The secret is a good ceramic coating and/or heat wraps. I plan on converting my fresh air intakes (the little nostrals on the front of the ghia) into cold air channels for the engine compartment, I should be able to run 10psi on the freeway/track and 5psi on the street.
What are your plans for the Super Beetle?
It will handle really well with some bigger (like PR185) tires. I never did anything but replace worn out components on the front of my super... In the back I put some super stiff adjustable spring overload shocks and lifted it slightly. This gives it a perfect amount of oversteer.
the only two things I would do to the suspension are:
3-way spring overload shocks
this will take you like 2 hours, cost you 90 bucks and make your bug a different car
if you want to throw in another $90, you can get a strut bar for the front... I hear they are noticable.