I have longtube headers and I am trying to figure out how much length I need to add to the stock plug wires as I am getting a set made for me and the guy asked if I need any extra length added how much would you guys add to stock set with headers in the stock location. these are the wires I am getting

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Not an easy question, some people play with stock routing and cable ties and say it can work w/o burning wires. Others use stock routing for front cylinders and OTVC for the rear. And then there are a couple of routing choices for 100% OTVC wires. Looked at the web site apparently they do have stock and OTVC wire sets for SBC's but not the LT1's. Have you asked specifically if they have LT1 setup's ? I had to cut , crimp and install boots on my Taylor OTVC wires and it was a PITA