To the op, and others listening. Have you run a 4.17" stroke 427 Windsor previously? I have one built but not run yet. I've read some story's that they may not make the power as the big bore of the same cid. I've read the larger crank diameter, dwell at tdc/bdc, and crank angle hocus pocus seems to hold them back. Not sure if there is any truth to that. I am looking forward to your dyno tests because I have the same stroke, same block, and a very similar cam as you do. However my heads and intake are quite different then yours. Mine is all forged and internally balanced. The guy I got my cam from claims it will make more than 600 flywheel before 6500rpm. I hope he right. Oh and I am a touch closer to 11:1.
How are you going to tune yours and is that included in your dyno session?