Was going to change out the copper tubing the previous owner had for fuel lines.
Running the LS3 if it makes any difference.
What are my options?

Tangerine racing's fuel line kit. Hands down the best kit out there.

When I built my six conversion, I used stainless steel tubing to replace the plastic fuel lines. At the time, there was no kit for them. Since then, I have installed multiple sets of the Tangerine lines. If I were doing it again, I would put a set in my car.

Clay

Agreed. I've installed Tangerine's kit in my carb'd 6 that had a copper line and also replaced my 1.7 4's plastic lines with his fuel injection kit which includes the engine compartment lines. Highly recommend him as a seller.

Agreed with all about Tangerine. Have installed a couple sets that work great.

Another thumbs up for Tangerine.

I'd first look at the size of the lines that were on the original car.