Yes, ...'tis true what you say.
I lived in Kaleefornia when I was doing the engine build on my Kirkham. Originally going for one of Shelbys aluminum blocks, but given the registration laws I opted for a standard bore 1965 dated side oiler block.
In Texas, the registration process is a bit more enlightened.....for now. Eventually, I believe their auto titleing and registration policies as they apply to specialty built cars will follow Kaleefornia's. Other states, too. The Feds will mandate it. If that happens, it may help to have such a block if you want to street it.
Hot Rodding as I/we know it will become more and more challenging to pursue as a hobby everywhere. Enjoy it while you can.
My .02 cents worth.
Bud
