removing studs from engine block??

[Dan Neuman <dneuman@stars.sfsu.edu>]

Hello All,
        I am trying to fit my gm one wire alt. to my new to me engine.
Its a 68 non-smog with right side alt mount.  My question is, The lower 
mounting point for the alt bracket is a stud. It is not long enough for my 
new alt.  How do I remove it and replace it with a ~ one inch longer one??
Studs are just pieces of metal with threads on both ends and a bit of  smooth
part in the middle??  Don't they just scerw into the block??  Could I just grab
the smooth part with vice grips and turn to remove it???

                Thanks,
                Daniel 69 2000