Passon 5-speed

I talked to Jamie about ordering last week. My car is a 69 swinger four speed 340. He was asking if my shifter handle was to be bolt in or press fit. Now I would like to do a pistol grip, but for now it is just a stock hurst, which is supposedly press fit. Jamie said I need a 71-74 B-body pistol grip which is a bolt in. Would I be able to switch back to the stock shifter if need be? I guess I'm looking for some clarification on the significance of the press fit or bolt in handle. Thanks