IMHO, the first and most important order of business is to decide what you want to do with the car, then figure out the engine build to match that. Rollers are good for higher lift while keeping durations lower (i.e., a more aggressive cam profile) and so fit a certain performance profile quite well: lotsa HP at higher RPM's. A pure cruiser does not need that level of lift and HP and RPM's, etc. And going to those levels of lift involves higher spring rates which gets into other vavletrain upgrades, like better rockers, etc., and the roller cams and lifters that are being discussed here cost 3-4 times a hydraulic flat tappet cam and lifters.
