Do yourself a favor and order a custom 18-circuit wire harness for your car from Painless Wiring....
from jeg's high performance catalog...
Painless Performance Products
'67-68 Camaro/Firebird, part no.-764-20101, $345.99 +s&h
"Includes everything that comes in the universal harness kits, but are specific to the particular vehicle. Just route it, terminate where necessary and plug it in. It's that easy." -lifetime warranty
sounds good to me....all you have to do is crimp your teminals on and you're good to go.....half the price of other places and less wait.
you can visit jeg's website if you want and search for it by part no, pretty easy......hope this whole post doesn't get edited for "advertising"...just tryin to help a guy out