A few years ago--when Gary Anderson was still editor--we wrote an article listing the tools and spares I carry on my annual long road trip (3-4K miles). Off the top of my head:
- basic SAE socket set (at least up to 13/16" which works for banjo bolts). I carry 1/4", 3/8" and 1/2" drive to cover everything from 1/4" and up. Use:
https://www.harborfreight.com/3-pc-socket-rail-set-68101.html
- SAE end wrench set (see above). A long time ago, I got some cheap 'rings' from HF that are perfect for keeping end wrenches together, but can't find them on the HF site now.
- pliers: diagonal cutters, regular pliers, needle nose and channel locks (large and small)
- assortment of screw drivers (Posidriv, Philips, and slotted)
- files: 12" and points. I used the points file to repair an OD relay in a motel in Salmon River, Canada
- spare fuel pump(s)
- spare OD solenoid
- spare OD panel switch (these seem to go intermittent every 50K miles or so)
- punches
- vise grips: large and small
- tape: electrical and duct
- tie wraps (various sizes)
- prescription bottle with assortment of screws, nuts and bolts (most small Healey screws are #10 X 32TPI)
- Bars Leaks or other cooling system sealer
- assortment of hose clamps
- spare Pertronix (pre-made with spade lugs for quick install)
- points set (suspenders)
- spare distributor rotors (think I have 4)
- electrical wire
- spark plugs
- complete secondary ignition system (cap and wires)
- small 'jumper' cables with alligator clips
- full size jumper cables
- tow strap (used once)
- full size spare
- plug type tire repair kit (I run tubeless)
- battery-powered compressor
- several quarts of oil
- bottle of DoT 5 brake fluid
- knockoff hammer
- road flares (4)
- bungie cords
- shop rags and terrycloth towels (for washing car)
- mechanic's wire
- wire clothes hanger with hook cut off
- awl and picks
- water pump (some may recall my horror story with a leaking pump and C****y brand replacements)
- small pry bar
- small hand metal saw
- some thin sheet metal pieces
- tire valve tool
- radiator hoses--top and bottom--and fan belt
- wire crimper with assortment of crimp terminals
- geared screw-type jack
- 12V drop light
- several flashlights
- Halon portable fire extinguisher (saved my bacon once already)
- window cleaner
- paper towels
- California duster
- car cover
- waterless hand cleaner
- 2 gallons of tap water (suitable for radiator or drinking). Just fits behind passenger seat.
- Bentley shop manual
and, oh yeah: a ball pein hammer. I'm debating getting a spare generator.
The tools fit--barely--in a tackle box-sized plastic tool box, the spares--except the water pump--fit in an Amazon box about 18"X12"X6".