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All of the Gen1 cams can be interchanged. The lifter bores are identical, the only thing that changed was adding and tapping the lugs on the center rib for the roller lifter spider.
The factory roller lifters are actually pretty good pieces. If you are staying hydraulic, keeping them and going hydraulic roller instead of flat tappet will give you a little extra power and a bit better idle quality.
Other than that, most of the casting and metallurgy quality is the same from the 80's and 90's.
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