Fuel Tank and Drive Shaft Questions

[fryer1979]

Ok, so a little chunk of cash is on the way to help me get my '65 closer to road worthy (and maybe even on the road). And with this it is almost time for me to get headed back into the junkyards looking for donor parts again. But before I go, I've got a couple questions hopefully you guys can help me get lined out on.

First is the fuel tank. I want to use a Blazer tank for under the bed, but am not quite sure which Blazer is usually refered to. Is it the K5 (fullsize) Blazer, or the smaller S-10 Blazer? And what years would work best?

Second is the drive shaft, and basically I am going to need one. My question is: would any driveshaft from any year (provided similar transmissions) 2WD C-10 longbed work? Or should I just look to find one out of a similar year truck? I don't mind replacing u-joints to make something work, just trying to get an idea of what to look for while I am out there.

Thanks fellas for your time an assistance, and any info y'all can give me would be greatly appreciated. Happy Wrenchin'!