Holley sniper vs. Edelbrock pro flo

280 at .050" is huge. You may have measured it wrong. The .050" lift refers to lift at the lifter, not at the valve. If you took the .050" degree numbers at the valve, then it will be waaaay too long.
Damn it your right. I for got to translate the .050 based on my rocker arm ratio. Now I get to do it again...yay