If I followed your thread correctly, you’ve upgrade both front and rear brakes. I run a M1858 on my 86GT which is a Lincoln part number with a 1” bore and SAE lines. One line required an adapter.
There is a Torino master cyl that is also 1” that is a direct boltup to the existing lines and it’s a direct fit with the stock booster. I don’t recall the number righ off the top of my head.
One of those would be my next move if I were in your shoes.
good luck!
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