Maybe right Monte as I haven't ran the 540 yet that those Indy heads are on. I think the motor will be about done in the low 7000's as it is. Jim tested the intakes with 2.25 valves just slapped in (no seat work) and picked up the flows below:
Just went and pulled one of my 2.25" test valves off the shelf and plunked it into one of your heads. Had to use one of those w/ special valve angles because your head isn't cut for the bigger valve. Did nothing but drop it in and test.
Lift...........before..........after
.100...........80............91 cfm
.200..........158..........177 cfm
.300..........227..........239 cfm
.400..........281..........292 cfm
.500..........329..........335 cfm
.600..........354..........354 cfm
That combo may actually be better for the Vortech blower instead of the B1 heads and 3.85 stroke crank that is in the 496, but right now with the 14-1 pistons in the 540 = no way.
Heads are a big part of making power 
Hopefully after dialed in Thumper`s gonna be a test bed for the new top end then some of my carb builds as I`ve already done. Great post which gives me more HP hope................. 