Spectra is a good brand and reasonably priced - $155 at RockAuto. You won't know what damage you've done until you've got it running again. If it doesn't overheat after you get it back together, you'll probably be ok. Usual damage is warped heads and blown head gaskets. If that happens, you'll button it back up, get on the road, and it will start blowing coolant out the degas bottle.
2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM