[silverstreak]

Sounds like a great motor spec to me! I'm pretty sure K Kraft did a great 527 for his own Kirkham a couple years ago. I remember him writing he was real satisfied with the results. I think he went 4.5 inch throw on his Shelby block.
I built my 511'' at 4.25 stroke and 4.375 bore with a big bore Shelby block and just picked a cast Scat comp lightwieght stoker crank because I set my ems to govern at 6250 rpm. All the power's made by then, no need to overwork anything. I spent my extra pennies on great rods.
Initially, opening the 58 throttles with commitment was intimidating. Like anything else you get used to it and realize you actually could use and effectively control much more power at the all important 40 to 140 mph range!
Good luck with your next powerplant.