I see what you were talking about now, not going to lie I am going to borrow your idea(s) here as this is exactly what I am looking for to retain the front end (without chopping the frame up).
I have hopes of getting this done in the next few months, if I have it "rolling" by then I will post here about the results of pedal feel (no engine though) - should stop like normal since it is a booster delete and contains a tandem 1" master cylinder (bigger than the 3G).
According to them, it can work up to 6-pot front and 4-pot rear combos, I will be running 4-pot front/2-pot rear so it should feel normal (if not better). It also has an individual rear bias adjust as well (lower spin knob).
Hopefully, it will do a few things:
1. provide a dual system in which if the front fails I still have the back and vice versa.
2. Give me the same pedal feel as if I had a brake booster.
3. Resolve the potential cam idle issue of fluctuating vacuum. On that note, it should give me consistent...
Could be the detergent in the petroleum, I have seen similar stuff in mine but I wasn't using any octane booster. Or it could be the cast iron breaking down from the heat (rusting).
I had a similar situation but I don't think you would want to do what I did, I wound up removing the whole engine, transmission, and transfer case because it was stuck. Oddly enough the shaft is still in the transfer case. It did take a bit of hammering but I did it outside of the engine bay...