The problem is that you really don't know what parts to buy...
If you are going to the meet for curiosity reasons, then I would say go ahead... however, if you are looking for a grand deal on a wiring... I don't know if it will be worth your trip...
Anyway, here is what cj's (
www.emustang.com )has as far as harnesses go:
1965 Under Dash Wiring w/ Gauge w/ 3 speed Heater WUD1C 399.95 Each
1965 Under Dash Wiring w/ Lamp 2 speed Heater pre 4/1/65 WUD1A 399.95 Each
1965 Under Dash Wiring w/ Lamp 3 speed Heater post 4/1/65 WUD1B 399.95 Each
1964-1965 Windshield Washer Pump Wire 1 speed WWPF1 4.95 Each
1964-1970 Wire Harness Retainer Strap 15 HW480 7.25 Set
1964-1966 Wiring Harness Retainer Kit 21 pc kit HW918 14.95 Kit
1965 Wiring Kit 6 cyl cp/cv w/2 spd heater WK65A 199.95 Kit
1965 Wiring Kit 6 cyl cp/cv w/3 spd heater WK65B 199.95 Kit
1965 Wiring Kit v8 cp/cv w/2 spd heater WK65C 199.95 Kit
1965 Wiring Kit v8 cp/cv w/3 spd heater WK65D 199.95 Kit
1965 Wiring Kit 6 cyl fb w/2 spd heater WK65AF 203.95 Kit
1965 Wiring Kit 6 cyl fb w/3 spd heater WK65BF 203.95 Kit
1965 Wiring Kit v8 fb w/2 spd heater WK65CF 203.95 Kit
1965 Wiring Kit v8 fb w/3 spd heater WK65DF 203.95 Kit
1965 Wiring Kit 6cyl cp/cv w/generator w/2 spd heater WK65E 217.95 Kit
1965 Wiring Kit 6cyl cp/cv w/generator w/3 spd heater WK65F 217.95 Kit
1965 Wiring Kit v8 cp/cv w/generator w/2 spd heater WK65G 217.95 Kit
1965 Wiring Kit v8 cp/cv w/generator w/3 spd heater WK65H 217.95 Kit
1965 Wiring Kit v8 fb w/generator w/3 spd heater WK65HF 217.95 Kit
1965 Wiring Kit 6cyl fb w/generator w/2 spd heater WK65EF 221.95 Kit
1965 Wiring Kit 6cyl fb w/generator w/3 spd heater WK65FF 221.95 Kit
1965 Wiring Kit v8 fb w/generator w/2 spd heater WK65GF 221.95 Kit