GFCI with high resistance ground

[Rox]

Recently bought a house from 1939 that aside from an addition and the kitchen, all the outlets are NEMA-2. All the 3 prongs in the kitchen are grounded, and the others have metal outlet boxes but only a few of them are well grounded, on most its only showing 2.5v to ground. So right now my plan is to upgrade all the outlets to 3 prong and put a GFCI on them. My question is, is there any reason I should not still connect the lugs on the outlets to boxes (high resistance ground), code, safety or otherwise?

What I'm thinking is that even if it is a high resistance ground, it should provide enough leak to trip the GFCI instead of waiting on someone to trip it.

 

[Dennis Alwon]

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