67MHR, I'm going to digress a little.
You're obviously just getting into the mechanicals of this stuff, from the questions posted. It's really too early to practically consider turbo applications. Look at the twists and turns every turbo installation here has been through. Without an excellent home setup, good finances, time and experience it's almost asking to come unstuck.
A lot of people "fixate" on the turbo itself. It's a neat size, looks cool and is relatively affordable. However, it doesn't address ignition control, fuel supply/regulation, intercooling, engine internals or driveline buildup.
What I would suggest is to keep reading, watch everyone else's trials and tribulations and keep notes on how things fail. Consider that Kirk has just destroyed a shortblock. You should be able to take note of the causes of that misadventure; in this way he is actually paying for your education - cool, or what?
The '67 engine bay is quite large. Why not consider a modified log-head 250? There's lots that may be done (look at "mraley" and his dyno results) to get more power and it's going to be far less destructive if not 100% on the money, than a turbo.
Once you get to the level of really knowing the sixes inside out, that would be a good starting point for a turbo build. Remember a key rule is to keep your project car operational and in use. A car that sits, is far more likely to never get finished.
Regards, Adam.
