48mm Throttle Body Project
I have everything for the upgrade now.  Just need the pricy rebuild kit with the gaskets.

So far in the project, I have the TBI unit and have done some minor work to it to improve some of it's air flowing properties.  I used the Ultimate TBI Upgrades.
Ultimate TBI Upgrade
Part 1
Part 2
After 1200 grit wet-sanding, but before polishing. 
Wonder if it will stay this way during the machining process.
After polishing.
Here's the price rundown on the TBI so far.

- Entire TBI unit $25
- TPI throttle blades FREE
- Throttle Body boring $30
- 350 Fuel Injectors $13