The gear change alone should bring the 60 ft down a tenth. I would say a conservative guess for just that would be 5.75. There is definitely some tuning that can be done with the fresh plugs. I believe it can run what my W8 ran that had a lot more compression and camshaft. The MPH is not quite as good but, it more than makes up for that with torque.

My W8 was a max effort CFE cylinder head with a light spinning assembly. These P7's are just some ole used NASCAR stuff and the short block is very conservative internally.

Leon