Getting it legal is a tough one.
Technically only the OE setup is legal on most cars in most states.
There are federal rules (Federal Motor Vehicle Safety Standards, FMVSS for short) covering all exterior and some interior lighting. Many states just use the fed rules. You can read the fed rules by following the link to the CFR (Code of Federal Regulations) on the links page in my cave. Fiero's OE headlight system is a B type system as described in FMVSS 571.108 I think. (Most all vehicle lighting is in section 108.)
You may also want to search the archives here. We've covered some issues before there but it has been a long time. Of note... Even tho many conversions aren't technically legal, if you can make them look legal, you will be much less likely to have problems.
Examples of things we've covered...
Some people use fog/driving lights to replace headlamps. This is highly illegal just about everywhere in U.S. and Canada far as I know.
Some people run "Tom's" conversion. This system, installed as Tom did it, uses standardised DOT headlamps. It's not fully legal but it looks more legal due to using DOT lamps. Many, but not all, state inspectors and others will ignore them as long as they see the DOT markings. Even the use of DOT lamps doesn't insure passing inspections or avoiding equipment tickets.
Edison Carter: When did the News become Entertainment?
Murray: Since it was invented.
The Ogre's Fiero Cave (It's also at the top of every forum page...)