ford 302 crank scraper..?

When the engine is running, even with a crank scraper, the crankcase is a virtual cloud of misted oil particles - the scraper has little effect on the pressurized oil that is constantly being sprayed out of the sides of the bearings.

In very close competition where every single horsepower might make the difference between winning and losing, it sounds like a simple enough addition to an engine - even if just in theory.

It simply makes sense to minimize the oil drag inside the engine - I suspect that's why dry sumps were invented. However, I doubt that there would be a significant difference in the horsepower at all but the highest rpm race engines - even on a dyno.

the oil is supplied to the rods and wrist pins through oil passages in each of them by oil pressure from the oil pomp not the crank spinning.

not a lot but the oil wont get churned up as much.