There are two flavors of 3.0 v6's. There's a 12v and a 24v. Those manifolds are not interchangeable, as the 24v has oval ports. IIRC, the 12v v6 bridged over between gen1 and gen2. The engines will bolt up to the earlier trannies, though. I want a 3.8v6 with 3.5 dohc heads in a gen1...

Not responsible for advice not taken...