I got a used Spec Stage 3 clutch disk and pressure plate. The clutch also came with the matching flywheel from the same car.

Now I have an aluminum flywheel that is smooth, but has some spotting on it (also used for a little while). I plan on using this flywheel instead of the stock one. Since the clutch is not new, should I get the aluminum flywheel resurfaced? How about pressure plate? Can I/should I resurface it?
The transmission and hydraulics will be new.
Thanks.

 

The safe thing to do would be to take it in and get it resurfaced. I don't know though, I'd bolt it up to the crank and measure for warpage, and if it was acceptable I'd just run it over with some 400 grit (preferrably with a circular sander) to remove any glazing that might have occurred. You could rough up the pressure plate too a little just to be safe but don't get carried away. I don't think any pressure plates are resurfacable, at least for standard auto apps, it's a wear item along with the clutch disk.