Whats needed to fit roller cam into my 1971 340?

Wht they mean by gears and intake is, "upgraded parts" which in my opinion you should look at the Edelbrock rpm intake and a set of 4.10 gears for the rear. Use headers, ported heads, 750 carb. (And 1.6 rockers IMO.)

That is a big Hyd. cam. Certain parts will need machine work. AKA, valve springs on a stock head.