It doesn't seem like there's further damage, and hopefully there isn't any.
If you go to Modular Mustang Racing's website, and go under the SOHC products, scroll down a bunch, you'll see that they offer new stage 1 ported PI heads with stock PI cams. It's just a minor stage 1 port and polish, so you'll probably pick up a little power with stock cams, plus you get new stock valves, springs, retainers, locks, and PI cams for $1,249.99 with no core charge.
If it were me I'd add $99.99 to that and have them throw in bronze valve guides.
YN Silver '01 GT - Main money pit
Black '01 GT - Racecar
'92 E36 BMW 325i - $500 daily driver
'86 Camaro - Sitting in a shed torn apart
'13 Kawasaki ZX-6R - Sold, too fast, want a Harley
'11 E92 BMW 328i xDrive Coupe 6MT - Daily luxury