I like to use items found more so than store bought detail pieces, although I do use detail master wires. I source a lot of things at the show/swap meets.
Hobby Lobby is another great place to find small detailing pieces. I also like to go with what looks best on a model not always true true scale.
Try narrowing your search too! Small block Chevy pictures in the search engine will give better detail. And one thing I do, if a wire runs some where you can't see why bother running all the way. Just do what looks good.
Any way, I look forward to seeing the progress on your truck.