I'm not sure the duke engines are widely interchangeable. I remember one of our Georgia members had to replace his duke and he had to do some modifications to get things to bolt together. The 88 uses a DIS system and is a much smoother engine than the earlier versions. I think the engine has more ECM management than 84-86 versions, too.
Apparently it isn't too difficult to upgrade to a 2.8 or 3.4 in the 88 base coupe. Upgrading to a 3.4 with a gain of 68 hp over the duke's 92 would be a nice kick in the pants, and all you'd need do is to bolt on a rear sway bar. I think all 88's are already drilled for the mounts.
The NC club is reworking their website. The old forum will eventually become the new forum, once everything is set up. Those guys are a great bunch and very knowing of the Fiero and mods to the drivetrain. Trinten, CowsPatoot, Chug and Drew-py, among others are well qualified.
I invite you to join us also at www.gafiero.org
[This message has been edited by fierofool (edited 03-31-2014).]