why go through all this work and put in a stock headgasket? if you are planning on modding the car AT ALL put a cometic or at least a hks mhg in.
just make sure either way you torque more then the 56ft/lbs in the manual.
also as for the block... you wouldnt really NEED to deck it for a stock hg... just check it with a machinists straightedge for warpage and if thats fine then use a razor edge to take any leftover material off and some brake cleaner and a paper towel will clean it up...
i did a stock HG on my car thinking i wouldnt need much more, i should be able to make 400rwhp on it... well i was wrong. it only lasted 6 months of 320rwhp and 16psi.
this was doing it with the block in the car, using a resurfaced head and a cleaned the block deck with Brake cleaner and single-edge razor. i used ARP head bolts torqued to 85 lb/ft with the moly lube.