In any case, there is pretty much no time out on the street I can aggressively put the pedal to the floor without the tires starting to break loose on the pavement, so plenty of fun for street driving. And as I said, it gets 17+ mpg.
Back to the Firebird. I properly re-timed the cam, it looks like with the thicker than stock head gasket on it the cam was timing was 1º advanced. So I dialed back what I set it too on Monday and set it to what should be 4º advanced. More realistic setting.
The valve springs and engine gasket kit arrived today, so I have everything I need to rebuild the engine now.
Rebuilding an OHC Pontiac 250 with EFI and a Turbo