I got another answer
A fellow I contacted at the Fiero Forum says I use the internals from a Pontiac v8 301 350 400 or 455. Apparently the internals just slide in.
Thanks for the info Joe, interestingly my Chevy V6 uses a hex drive on the distributor too. That is the 2.8,3.1,3.4 series
I'll keep you posted.
Thanks for the help guys.