Where to put my crank case breather tank

It really depends on what you're trying to accomplish with the breather "system". A lot of guys run them due to excessive oil showing up in the intake runners, and pooling of oil on external surfaces, but there are several things you should be aware of:

Baffling of your valve covers will go a long way toward reducing the mist and oil puddling on your engine. The baffles should be considerably larger than the opening (breather hole) and only leave about 1/4" gap for breathing. This is a must, as anything you do downstream will have little effect if you continue to run non-baffled valve covers.

Next, you need to decide what you want to do with your "remote" breather, which is really nothing more than a remote "accumulator".

Do you want to plumb it to the exhaust (ala race car style) ? The draw back to such configuration is that you can exacerbate oil consumption (oil can be siphoned through the valve covers due to the exhausts "pull" on the hose) and the misting can show on the underside of your car - if ran this way for too long. It's important that you keep an eye on oil level using this configuration.

You can mount it on the fender, fenderwell, radiator bulkhead, or ? However, these units will accumulate oil over time and most of the guys I know just dispose of the oil when it's time for an oil change. Of course, you still need to determine if your system is contributing to any "loss of oil" as you drive it.

Under ideal circumstances, you can mount the unit in such a manner as to permit the accumulated oil to be fed back into the engine, thereby reducing your engines oil misting and consumption. On some cars you can use the fuel pump block off plate by welding in a hose barb to attach a 'return' line from your breather system, which allows you to reclaim any oil bypassing the breathers. Such a system will result in the lowest loss of oil from your engine and keep things clean.

I hope this helps.

Southernman