Frame swap registration

[Ziegelsteinfaust]

I was messing around on the internet, and I saw a slammed International Load Star.

http://www.stanceiseverything.com/20...onal-loadstar/

I live in California, and I wonder how people with registering these things sometimes. Since I would love to build one for messing around rather then serious work, but rather normal 1 ton towing.

Which matters most when registering a truck the Cabs year or the frames year.

Lets say I get a 77 Load Star, and put it on a 74 dually frame. Which would be the way it gets registered. To me this is important so I can skip smogging it every two years, and excess tax when registering.

I asked the lady at the DMV one time when registering my C20, but the blank stare told me she had no idea.