fattest cam in a 340?

I have a Comp Cams XR286HR-10 hydraulic roller cam in mine which I consider pretty "fat" (.541 lift) as you call it, however, I had my engine builder blueprint the internals to match it( springs, pushrods, pistons, etc...) If you want to hear how that thing sounds, it is in my resto forum listed in my signature link. I built my motor for performance, not sound as everyone one suggested on this forum and did a lot of research prior to the build. I ended up with a good lumpy cam as a bonus so do your research otherwise your motor will be a dog. Mine is a 340 so it is possible and she dyno'd 421hp w/408 ft lbs of torque at the flywheel.