Thanks Donovan. Nowhere near close to the point of doing the lights on the wagon. Actually, exterior is probably the last thing I'm going to do. The other option I was looking at was LED 4x6 sealed-beams. Right now (subject to change, of course) my plan is:
Interior: Dakota Digital VHX gauge cluster, T-Type 3-spoke steering wheel, rear outboard shoulder belts & child seat anchors, updated radio headunit (period-correct look)
Chassis: Box frame (Hellwig Frame FX), powdercoat
Powertrain: LS3 or LT1 E-Rod Connect & Cruise, Rear Axle w. disc brakes, 3.08 or 3.23 rear end
Suspension: Hotchkis or QA1, Front brake upgrade (Wilwood or Baer), 245+ 17-inch Circle Racing Buick Rallye-style wheels.
Other than that, want to keep it pretty original-looking. Not looking to build a dragstrip demon or autocross hero, but something reliable I can drive on a regular basis and enjoy.