c20 LWB to SWB conversion, tanks brakes?

[bloodybigblock]

1986 c20 crew cab is the truck I plan on doing it on in the near future. Can I go ahead and install the 16 gallon tanks on my truck now until I actually cut it down. Is this pretty strait forward? I'm under the impression that I will need to drill new holes for the smaller tanks. Also do I need anything brakes wise or just shorten what I have now? If anyone has any pics of how their tank/tanks are set up that's be nice. I plan on hitting the junk yard and getting the tanks I need and using my stock sending units in those tanks. Thanks