About the only way to guess if it has blown head gaskets is to drive the vehicle and monitor the temperature gauge. If it moves a lot-- and the heater blows warm air and then cold air, I would suspect a leaky head gasket. Also let it idle with the reservoir cap off and look for bubbles.
Of course the hard upper hose, after it has set overnight, has always been a good indicator.
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.