Most of the EFI mustang engines have little to no bore wear so you can probably have a machine shop check it out. I Would spend the money on heads, cam and intake. you will get a lot of bang for the buck that way. Re ring and install bearings arp rod bolts, and a set of AFR 165 heads, custom cam, a quality carb, victor jr, or air gap good igntion and go kick some but. Most people stroke these motors and I don't because I'd rather spend my money on air flow. Strokers run good but they are expensive. Your can build 400hp at the crank for little money without stroking. If you blow it up then stroke it.

Later Just my Opinion