I'm running a 2 speed Glide and ran 10.5X with my stock long block making about 460 to the wheels. Should be no problem with 565! I have a lot of weight pulled out in my current race form.
Yes my sig is still when I had my stock long block in. The new set up is a WAP Block out of an 03 Mach1 that has been bored 20 over with a Kellogg forged stroker crank. Ross pistons 11-1 compression with PP PI heads and custom Bullitt Cams.
The track is Irwindale Race Way in SoCal.