A job????
But seriously, it's hard to say not knowing what's already out there. Is anyone reproducing quarters, fenders or door skins yet? When my '87 Aero got totalled back around 2000, the driver's quarter was already discontinued. How about turbo Regal hoods? The 78-80 parts are harder to find, but at the same time the demand for it isn't as large either. The '80 Regal and Cutlass have one year only front ends. The 78-80 Salon and Century coupes are rare, but we're back to the demand again. The '87/88 Cutlass grilles are a hot item too.
-One thing I'd really like to see is some over sized factory wheels with the correct backspacing for our cars. I've seen a lot of the stuff Year One offers but they focus on the A-body & F-body crowd. I really like their 17" cast Rally II's, Snowflakes & Honeycombs but they only offer a 17x9 with 5" backspace. They do have 17" N90's for the Montes and they look great on them.
A reasonably priced 17" or 18" Buick, Olds or Pontiac rally wheel would be nice. I know there's billet stuff out there but I wouldn't spend $800/wheel either.
-What's available to bring our ginormous a/c boxes up to recent standards and trim some bulk? Not everyone wants to delete their a/c but that cumbersome box is just in the way.
-How about the t-type, GN or diesel pedal assembly used for hydro boost conversions?
-An available steering shaft adapter for the '78 steering shaft. Every year after '79 can utilize the jeep shafts and ditch the rag joint. The' 78's can't.
I'm sure I can think off some more things eventually.