'71 with an LBZ duramax. Need advice on fuel tank.

[01chevduramax]

I put some time in today. I got the Bung welded in. Ended up going with a stainless ball valve. Ran my 1" stainless pipe across the fuel tank at floor level. Used an elbow to turn down. Ran through the cab floor with a 1" npt stainless bulkhead. 8" nipple to a 1" tee. Plugged the rear port in the tee for now. Reduced the front port to 1/2npt. Then braided stainless hose (jegs pro flow 200) to the lift pump. Ran 1/2" stainless fuel line with Swagelok fittings up to the engine. Waiting for parts to finish the return lines.

I guess I'll drive it like that for now. Ill build the second tank with aluminum. Doing the math it should be 15-20 gallons or so. I'm hoping for 16mpg with it. (38" tires).
id be looking at almost 600 miles for range!