If the pistons are stock, it probably isn't 10.5, but if it is, you'll have to run a little more cam with pump gas. Get the 3400 pound SS springs and use a snubber. Rides a tad stiff, but it will slap you back in the seat when you nail it. I have a customer using this combo running 12:30s, with a 9.0:1 360. Surprises a lot of big block guys.