There's alot of horsepowwer in going from a flat tappet cam to roller,you pick up as much 75 horsepower.
Comp cams make a retro fit kit doesn't require any machine work.That will have everything needed to install the cam.
For lifter I would use Comps 853's,they are for a retro fit install and just like the stock roller lifters,it's the Pro Magnum or the "R" lifters poeple call them that they had problems with.
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