Couple of things about the 3.0 rockers: first, you must have hydraulic lifters to use them. Second, they are a 1.6 ratio to the original 1.5 ratio, so you get better performance from the same cam due to higher lift. Third, I would install new valve springs with the rockers and new lifter - old springs could break from increased compression of the springs, and new lifters so they don't collapse with the new rockers. They also are roller tip on the cam side for less friction - this is a common mod for the starquest groups.
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