I have a 2gen gto and just installed the cianci novara front bumper and 99 headlights, no big deal.
since you have the 1gen you will have different headlight buckets
http://www.3sx.com/store/faq/99/index.asp
when you want to do the 99 conversion I'd suggest looking at
CIANCI Performance - Quality Automotive parts for your vechile for the novara front bumper, it's certainly worth the extra cash, excellent product and ryan is great to deal with.
If you have a question just let me know