pcv and thermostats for street strip cars ?

Adam, If the idle is a concern I could see not wanting a PCV..But really, it does no harm in any other case. The "dilution" is very minor. You can run the evac systems, but like Guitar said, you will need to ge the right valves for your exhaust, and they dont work at all at low speeds when set up right. Years ago there was a super clean burning Pontiac in PHR I think that used valves to help dilute the exh before the cats. You can buy the valves seperately, but you'll need to research at what level of vaccum they open at. I hate just breathers on anything but a race car. You're constantly wiping and cleaning, and nbo matter how good you are about it, you'll end up with big dirt and dust collections below and around them at cruise nights.
As far as thermostats, the hottest you can control the temps at, the more power it will make. With aluminum heads, I'd aim for running temps between 190-200°. Lower and your valve lash changes the wrong way, not to mention idle quality and mix.