I need a small master cylinder with 7/8" bore

I have an update. I took the car out of storage a few weeks ago and got back on the problem. Bought a brake pressure gauge that screws into the bleeders and checked the pressure. Turns out there was still air in the lines despite repeated bleeding. I was getting 500 psi at the calipers and if I pumped them up and applied heavy foot power it would go up to 1000 psi. So I bought a power bleeder by Motion products and it took about 15 minutes to get all the air out of the system. I now get 1000 psi to the calipers with firm but not excessive foot pressure on the pedal and the pedal feels nice and firm. It did improve the performance but still not as good as a want or expected. I pulled out the Wilwood paperwork and receipt and checked the part number of the pads they sent me and they are the correct pads for street and drag racing. I called Wilwood and spoke to a tech guy and he says to pull the calipers and scuff the rotors and pads with 100 grit sand paper. That's my next move and if that does not solve the performance issue I'm going to install a hydroboost sytem to simply get more pressure to the calipers. I can lock up the wheels with high foot pressure but these brakes simply don't have a nice immediate grabbing feel when I apply the brakes. I have the adjustable proportioning valve (it limits the pressure to the rear brakes) set so its not limiting any pressure and am getting 1000 psi at all four calipers now. My opinion is that the brakes are too small. The car weighs 3500# with me in it.