Having owned a 69 Big Block, I can offer some areas that I focused on:
Engine health - Especially in Vegas, cooling system 100%
Engine mods - I did a cam upgrade to make it a little happier mid-range. Headers and better exhaust, but still stock-ish. Maybe look into the throttle-body EFI so no vapor-locking and better running? Hides under the air cleaner for a good look.
Brakes - YES!!!! Best you can put inside the `15" wheels
Better shocks and sway bar connections. Connect it better to the road.
Front suspension & steering - New & Tight!
Engine health - Especially in Vegas, cooling system 100%
Engine mods - I did a cam upgrade to make it a little happier mid-range. Headers and better exhaust, but still stock-ish. Maybe look into the throttle-body EFI so no vapor-locking and better running? Hides under the air cleaner for a good look.
Brakes - YES!!!! Best you can put inside the `15" wheels
Better shocks and sway bar connections. Connect it better to the road.
Front suspension & steering - New & Tight!