Your stock lifters will be ok with the new cam. There are some cams that come with a powerband that starts with around 1600 and ends at 6000, this is what you need to look for if you dont want a higher stall. You also need stronger springs for the added lift. Try calling Comp Cams and talking to a rep cuz choosing a cam is really personal choice and preference. Some guys want more power up top, some like more power down lower and midrange, some just want a choppy idle, etc. As far as the exhaust bolts, a good soak from some penetrating oil helps alot. I have used heat to do this but most the time they come right out with no problems.