Your first car upgrades? (Electrical/Mechanical)

This can be for running project cars, or like in my case a driver quality done by the P.O. or even a restoration you purchased. Body work/paint interior are a separate category.

Anyways my first changes were an MSD ignition and distributor, repairing a damaged carburetor (broken mixture screw) and going from 2.76 gears to 4.10. I paid a shop to beef up the 727 transmission as well.