Well, I continue to benefit from Don's travails. I pulled out my original master cylinder yesterday, cleaned everything up and trial fitted my pedals. My observations are as follows:
1. I have exactly the same side clearance issues that Don mentioned, so I have ordered the same oilite bushing from McMaster-Carr. I actually ordered several of them, so if anyone needs any I can save you some shipping costs.
2. I've been mystified by the need to drill an extra hole for the third mounting bolt, so I started measuring the holes. What do you know, the 3 existing holes perfectly match the OEM master cylinder IF IT WAS MOUNTED BACKWARDS. I think we have a design failure in progress! So I'm taking my mount to work to have another piece of steel welded on and drill it to mount using all three of the OEM mounting locations. I'm also going to add the stops for both pedals just like Don did. Once it is completed I'll be documenting everything and sending it to ECI.
3. Lastly, one of Don's comments caught me by surprise. He had to take the pin on the OEM brake pedal off again to add the connection point for the return spring. This was news to me, because my car has never had anything there! I'm guessing that it got lost during the engine swap (or was never there at all), and I didn't know it. So I'm wondering if anyone has a parts car that they could get the eyelet and the spring off of, and tell me where the other end connects? I've got a lot of OEM front brake parts to trade!
Marty