Which master cylinder?

Try the 85 Town car 1” MC. It should be a direct bolt on for the SVO as they both use SAE thread pitch fittings.

The SN95 MCs are a little bit of a PITA to plumb is as they are metric thread so you will need to cut and flare

Let me run the numbers in the AM. I have some data on my PC on MC ratio calcs.

SVO calipers are 8370mm^2 of piston surface area. 99-04 CObra calipers are 5152mm^2. Rear calipers are 4580mm^2 and remain constant.

SO swapping the SVO fronts to the cobra calipers is a 25% reduction in total surface area of all the calipers.

1 1/8" SVO is 638mm^2 of area. The 1" bore MC is 507mm^2. That;s a 20% reduction. That's as close as you are going to get.

1993 cobra, and 85 lincoln town car both have 1" bore MC's, but the town car MC will be an easier swap since it's SAE threads. However, the SVO MC might need an adapter since it appears one line is a different pitch. You might need to swap it with a standard GT line. Unfortunately i don't know this info completely, so you might have to do some legwork