[olddog]

As someone else said the durration seems right and the lift is on the mild side. I cannot recommend swapping in more lift, without pulling the engine, so everything can be propperly measured. There is piston to valve clearance, sping coil binding, pushrod rubbing intake, and more things that need to be checked. It could be done in the car, but unless you have a good back and don't mind ending up with a bad back, I wouldn't do it.

Unless the heads were flow tested, you really have no idea what the improvement will be with more lift. You will most likely get a little more flow, but it may not be much more depending on the heads.

I never heard of higher ratio rockers for a FE, but if they exist, this would be a simple way to get more valve lift and slightly more affective durration at the valve.

I would bet there is more Hp to be gained in a good set of heads than a cam swap, unless you already have a good set of ported heads.

I guess if I were thinking of going down this road, I would pop a set of valve springs off and measure how far the valves can open with the piston at TDC. Then talk with an expert before deciding how much lift and durration the engine can handle.