I just bought a B&M shift improvement kit from jegs and was wondering what stage to use. It has two stages, stage I :RV/Heavy Duty, Stage II :Street/Strip. The reasion I am asking is I have no exprence with any shift kits and have no idea how harsh the shifts will be. It's going in 74 f-150 longbed with a very mildly built 390 FE. I dont do alot of towing maby once or twice a year. I use it mostly for a work truck. I'm sure I would be safe by going with the stage I ; however, I would like to hear opinions about using the stage II in a truck from people with exprence.