That "master cylinder pushrod" is just a filler that company makes so you can use a manual master cylinder with a power brake booster. Since you can still adjust the pushrod in the booster, my technique for adjusting the clearance between the master and the booster is still valid.
Since the combination valve is for a disc/disc setup, you should be okay there. One other little quick check is to make sure there is no residual pressure check valve in the master cylinder itself. Take a small allen wrench or drill bit and put it into the fittings on the master where the brake lines attach. If there is a check valve, the tool will only go in about 1/8" past the seat that the brake line seals on. If there is no check valve, it will go in about 1/2" or a little more. You are probably okay there, it is just good to check.
Make sure that if there is a way to adjust the parking brake on those rear calipers that you adjust them up snug.