The pistons!!

I can finally start building my new engine!
Two questions though, which way round to the pistons go, arrow and small valve cut out pointing to the front of the car or to the rear?
Was such a long time ago that I took mine out I cant remember! lol
Also these rods dont have an oil spray hole like normal rods (which I think is odd?!) so is there a correct way round for these or does it not matter?
Cheers!