z31sham

Recently replaced my fuel system on 70 240z. Started it back up last night after a few months of been idle. Started up a little lackluster but nothing uncommon. After two minutes of rough idle the carbs started to stutter or burble. I'm adding links to the youtube clips I took. I didn't run the engine for much longer just incase. Fuel system: tank - filter - pump - regulator - manifold - carb - carb - carb. Any thoughts? https://youtu.be/holqzub_U8w https://youtu.be/UyFgPYs0-fA

What size rect tubing did you use for the frame rails and crossmembers?