Yes, you can use a early model DOHC, but you will have to use
the intake system from the SOHC engine.
That is what I have in my '95.. it's a DOHC with a SOHC intake
and it runs great. It's 190hp vs. 175 SOHC engine and it has
the low end torque that the DOHC doesn't normally have.

You will also have to use the ignition system, wiring harness,
and exhaust manifolds from your SOHC. The EGR is in a different place on the DOHC, so to mate it up with the SOHC, you have to use the SOHC exhaust manifolds.

You'll use the airbox and throttle cable from your existing
SOHC also.

Other than that, everything pretty much lines right up and
goes in without a hitch.

Here's a pic of my DOHC in my SOHC truck.