Looking for Tips on building a fuel system

Yes I did read that. And that is the ultimate plan. I just have not removed it yet. Currently the braided fuel line comes off the mechanical pump outlet with a flaird fitting. If I remove the pump now I have to find a way to attach the fitting to the strait steel fuel line which has a rubber hose and a clamp. I am thinking this line is too small anyway as I believe it is 5/16. I would like to install at least 3/8 hard line back to the tank. I am still collecting parts for this so to keep the car mobile I installed the Carter pump and plumbed it to the fuel line temporarily. Also while a ruptured pump diaphram is a concern, this car has had a pusher pump feeding a mechanical pump for the last 30 years at least. I am keeping an eye on the oil level and condition.