Check the pricing before you do it, you can buy a new ford one for $100 and avoid a lot of problems. Make sure if they cut more than 20 thousandths off to a max of 50 thousandths that they give you a spacer for between the crank and the flywheel to maintain proper clutch disengagement. If you take more than 50 thousandths off, its junk and you'll need a new one.
Check your local machine shops...mine did it for $25 dollars...and looked good...
You don't need a spacer unless you have resurfaced your flywheel more than once...the "thousandths" can easily be adjusted with the clutch cable...
And if you have resurfaced the flywheel "several" times before you probably could have already bought a new flywheel...I would suggest just to get a new one anyways...so you don't have to make any special trips and wait at the machine shop and also take a chance on it being done improperly (either switched out or ground off unevenly)...