On a typical 96 Bonneville SE, how much power and et is expected to be gained?

Not beneficial, get ZZP'* ER rockers.

Should be in the 20hp range or so, assuming you can support the flow (PEM'* or headers would be great with these to really get things moving).

IIRC 1.8 rockers are better for the N/A 3800'*....

Let'* give numbers only folks.

The signature says they are already on the car.

yea but bill it says 1.9'* and a cam, hmm too much lift? Can you clarify this speedster? As for numbers i would say about 15-20 hp, and agreeing with willwren about having to be able to flow to acheive those numbers.

Looking at SLP'* later on too

Or Throttle Body

:?

What springs and timing set are you running?