Which tank & driveline? LS powered '57

[yossarian19]

I'm figuring out which parts I'll need and have stalled out on the gas tank and the driveshaft.
I've considered using a stock replacement '57 gas tank and an external pump & filter setup. It should work just fine, but I don't know if I can do better for the money I'd spend. I figure I'll be $500 into the fuel system by the time I'm done, maybe more. $150 + shipping for tank, $2xx for pump, $80 for regulator For $500, can I do better? Under bed tank, in-tank pump, etc?

What are people using for a driveshaft? I have the old shaft that ran from the SM420 to the 10-bolt. Just have a driveline shop cut it down & mate it to the 4L80E?

Radiators... Anything from an OEM application that people have found? OEM parts I can buy wholesale. Custom is $$$.
Thanks for any help!