Bring the tools to fix the issue you have parts for. If you don't have the part. You don't need the tool. Spare parts are expensive. So is travel, fuel and entry. Weigh it out. The best thing you can do is keep up the car before you leave for the track. That being said no reason not to have sockets, ratchets, extensions, end wrenches, pliers, screwdrivers, allen wrenches, hammers. Extras that I consider necessary? Weather station, voltmeter, test light, terminals, wire, bolts & nuts, duct tape, jack, jump box. Parts? carb parts, coil, cap, rotor, plugs, plug wire, line lock rebuild kit, starter, water pump, tire plugs, spare slick tube, valve springs, oil, brake fluid, trans fluid, water. If it needs more than that chances are I'm going home. If you have an enclosed trailer the Harbor Freight tool cart carries all you'll ever need for less than $200.
Doug