If you have a good running flat tappet cam setup I don't think it's worth changing over to a roller cam. Now if you were building an engine you might want to consider it but it is a lot more expensive.
If you bought a roller cam and lifter setup they'll tell you what push rods you need, not sure if you need new or not.
The real advantage is not having to worry as much about what oil you use, don't need the ZDDP levels a flat tappet performance cam does. But how often do you change oil in your Chevelle? Is it a daily driver?
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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