The spirit of my post was how to do things cheapest. With good drawings and some basic knowledge of how to make things you could take a $40 junk throttle body to a local machine shop and have all the work except polishing and assembly done for $75-100.
This beats paying Gude $275 for their bored TB (good product by the way) plus sending your existing TB as a 'core'. Of course, with the Gude all you have to do is 'bolt it on' but you are out $275 plus shipping plus your original body.
Using a junkyard TB, I got to develop and perfect the TB without taking the original off the car. it took me about an hour to remove the original, bolt on the modified TB and adjust the throttle sensor.
In terms of difficulty, designing and building this TB is about as difficult as changing cam gears, and definiely easier than reprogramming the ECU, or port matching the intake to the head.
