pcv and thermostats for street strip cars ?

Two breathers will be enough if your motor is solid and doesn't have a lot of blow-by. Circle track guys use two breathers and seems to work well.

No such thing as a low buck vacuum pump system and stock air pumps do not move enough air.

I run a 180 'stat, warmer motors will wear less on the cylinders. I have done both the under driven belt drive and the electric pump. I tested both at the track and could not find any real measurable difference in my performance. So I went back to the belt drive pump to take some load of the alt. I do run an electric fan and that is were I found the best gain on performance between the too.

You can use a pump without the by-pass hose. If you do you will get more flow thru your radiator because all of the collant will be forced to pass thru the radiator. Which is OK if you are underdriving your water pump because now the flow thru the radiator will be about the same as the high speed pump with a by-pass hose.