The 32mm valves should serve you well. I ran computer simulations on the valve sizes that I used in my heads and it seemed to give me pretty accurate estimates of torqe and HP.
I ran the simulations with 32mm valves and it seems that the high RPM breathing would definitely be improved though it may lose a little torque below 2000 rpm. However, you should still be making more torque below 2000 rpm than the stock 2.5L so you won't notice any problems.
I think the intake and exhaust valves are the same material, so you may be able to use the intakes from the 2.5L as your new exhaust valves. Check with a machine shop to be sure.
Then all you would need to buy are 35mm intakes from the taurus duratech.
The valve springs, seals (which includes the valve seat as the assembly), keepers, etc. are the same on the 2.5L or 3L. The valve stem diameters and lengths are the same. Therefore you can use all of your 2.5L stuff.
If you want to use new cams, all you would need to buy are the roller finger followers, though I would tell you that and engine isn't fully broke in until maybe 20K miles. That information comes from oil testing reports that tell how much metal is found in the oil. For the engines that were tested in the report I read, the levels of metal in the oil don't start dropping off until around 20K miles. THis is an old report however, so newer tests may vary.
If you still want to buy new valvetrain components other than the roller followers, then bear in mind that there are two keepers per valve, so 48 would be required. They may sell them as a pair however, so you should check on that.
Good Luck,
warmonger
