What's unique and what are the upgrade limitations?
From what I've found:
1. 287 G head...good and bad. Good for porting and flow, bad for limited pool of parts.
2. Dished G head pistons...unique to 84 and 85 model years...are there aftermarket forged parts available?
3. 6 bolt cast crank shaft...does this limit transmission upgrades (525 to a 555)?
4. Small spline half shafts
5. Skinny distributors and different HEP's.
Anything else?