Use 1.6 on the exhausts. Check for spring coil bind, retainer to guide/seal clearance, piston to valve clearance. If you were using stamped rockers, you'd also check for rocker to stud binding, but with rollers, you can skip this operation.

Rocker roller tips should start slightly toward the intake manifold at valve closed, sweep across the valve stem and be at the center of the stem at 1/2 valve lift, then continue to sweep toward the exhaust manifold at full lift. If the geometry is wrong, get some pushrod length checkers (adjustable pushrods) from any cam grinder and determine the correct length to give you the characteristics I outlined at the beginning of this paragraph. Then order the correct length pushrods according to the length of your checkers that worked the best.