[blykins]

Yes, with the right camshaft and detail to the build, you could probably run 10.5-10.75 on 91. However, the horsepower difference between 9.5 and 10.5 is going to be negligible. IMO, it's best to stay on the conservative side and not have to have any worries in the back of your mind.

Not sure if Barry has any heads in stock, but BBM should have some. A BBM head coupled with a Performer RPM intake will make a very happy amount of horsepower.