fuel tank and bed bushing questions

[hpcgmc]

I'm restoring my 67 GMC 1/2 ton. I pulled the original gas tank because I knocked the locking fuel cap into the tank about 25 years ago, when I was far from home without the key. The tank I purchased to replace it is out of a newer 67-72 truck. The newer tank has a vent line that goes between the tank and the filler neck. Is there any reason I can't use this tank in my truck? I figured I better check before having the new tank boiled out.

I'm also pulling the bed to cleanup and paint the frame. I'm not doing a total frame off/powder coating, just a quick cleanup and paint with POR15 or something similar. Are there any bushings that go between the bed and the frame? I read somewhere that they didn't have any from the factory, but there might be some available aftermarket. Any reason to have or not have these bushings? If I install the bushings, will they raise the bed so it no longer matches the correct bed/cab height?

Thanks!