Unchained,
I too was introduced to turbos in a car (not a sand rail, and no where near 28 lbs of boost). I took on a hobby project of putting a turbo on my 2055 cc 914 engine. I put the hole thing together myself (including welding exhaust). The wastegate is set to limit boost at 13 psi and I have a hobbs switch triggered NOS fuel solenoid to add fuel above ~ 7 psi. I did have to put in a 911 clutch to hold the torque. It's a real fun car to accelerate in, but it doesn't idle real well (I think due to carb-to-turbo manifold icing, I need to run an oil circulator around that manifold to heat it). I'm runnung a Weber sidedraft pull-through system. It was quite a project getting it all to fit in the 914 compartment!
As far as my boat goes, the boost is limited by blow off valves that reroute the A/F mixture back into the carb. They are set at 8 psi. I could plug them for more boost or get stiffer springs. I havn't tried either yet. Tim