IS there any physical difference between the La360 vs. magnum 5.9 Crankshaft???

I pushed up to 12 in my stock bottom end 302 (with a 020 under turned crank, stock rods, and stock iron heads) for over 10K miles before I sold the eng/trans to a friend of mine. It never missed a beat and was a daily drivable 11 second car.

Seeing that you've built other boosted engines in the past, you know full well the biggest things you have to worry about with boost and stock bottom end parts is going to be making sure you eliminate any detonation (better gas, conservative timing), open up your ring gaps to suit the extra heat produced by the increased combustion temps, and use an appropriate (read: colder) spark plug...with 8-10lbs, I'd honestly recommend you go 2 down on the heat range.