Sorry for the delay. I have completed my full analysis of the Tornado braking system. It is attached as a pdf. I had to reduce the front master cylinder diameter, increase the piston diameter in the rear, and change the pads to get the basic braking system to my satisfaction. The brakes work fine now.
When I replaced the rear calipers, they didn't have the integral parking brake. So I installed the Wilwood MC4 parking brake that Bill also used.
You can see my full report in the attached. I will be happy to provide further information or drawings if you like.
Note: when you click on the pdf, it appears at the lower left corner of the page and you have to click it again.
-Bob Woods
Tornado GT40 in Texas