Replacing the tank is an interesting approach. I ALWAYS get the distributor rebuilt, and the radiator professionally serviced on a “new to me” classic car.
That repro tank does look nicely made, and $395 is very reasonable.
I wonder what they are coated with…E-coat? I have a friend who used one of those “slosh kits” on a very complex fuel tank he fabricated, and it quickly peeled off, and started blocking his pick-up. He ended up having to cut the entire bottom off the tank, scrape it out, and weld it back up.