Before I power this thing on and risk hurting something I was wondering if the head and cab I have will work together. Here's the gear...

HEAD: "Marshall Valvestate 8200" 200watts total 100watts per side (4ohms) 80watts per side (8ohms) (Hybrid head)

CAB: "Crate G412SL" 8ohm 120watt

Will this set up work?

Yes, just make sure you match the ohms. Any cab with any head will work with the correct impedance.
Agile AL3000
Douglas WRL90
J&D Strat
Squier Tele
Sammick TR2
Douglas Draco
Peavey JSX
Bugera V5
As long as you don't crack it past the max of half-way, you should be fine.
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