I see that. the 540 has 4.250 stroke and 4.500 bore. The 511 has 4.250 stroke and 4.375 bore. I would think the 540 is a better package with the much larger bore than the 511, but what do I know. I have no personal experience with a 540.
I wouldn't use the victor on the 470. I would use the RPM, because I can get to same goal with less money. RPM heads are about $1600/pr complete and victors are about $1600 bare and take $1100 rockers, so I would say the 470 could be built with less money. Maybe i'm wrong, your in the business, so you should know better than i.