Sounds like you are all set. The key will be rail height and achieving the cushion nose height of 1 - 29/64 (where ball contacts). Once you determine rail thickness (probably around 1- 3/4") should be easy math to determine angle for cushion mount. There are diagrams around the internet for the two major profiles, K-55 or K-66 that list all key angles, dimensions and so forth for the subrails. You might want to verify your rail thickness first to determine which profile you need prior ordering rubber. If you are going from a typical old Brunswick, or some other odd ball profile, to new Black Diamond K-55 then more than likely it won't be as simple as recutting the sub rail to a new angle. If you do that alone I think you will lose the proper play field dimensions, plus pockets won't be quite right, so you may have to cut off the old poplar profile and add a new section of poplar, then cut the new angle. I have plans to do that myself on an old Anniversary, but I think I'll just start from scratch and replicate the rails correcting the dimensional problems that a previous mechanic did when they merely cut off the sub rail to the correct angle without adding poplar to ensure that the original dimensions were maintained. It's a pretty expensive endeavor considering the cost of mother of pearl sights, the hardware, the head rail data plate and the walnut and poplar required.
Edit: I didn't know Brunswick used MDF for their rails. You might be better off just finding a good used Gold Crown instead of trying to overhaul an MDF table. I don't mean to be a snob in regards to an MDF table, just trying to be honest with you. A good Gold Crown can be found for pretty cheap these days and you will have a table with poplar rails that is already tuned for top-notch play, and 10 years from now it will still be worth what you paid for it. The old Gold Crown I and IIs may require some subrail work to convert to new K-55 profile.