For me, and I assume a lot of people that would be interested in doing this, the cost to build from a stock engine with new parts would be the most beneficial. Then subtract off the mods that you have. That is the best way to gage things. Start with a stock engine L67 and add up the costs to completion. Then compare it to similarly structured prices of other mods.
Just my $.02
The TVS swap goes heads up vs a full size IC + ported heads and GenV...
Power - We'll say too close to call, edge to the TVS. However you could still do heads/IC with your TVS
Cost - TVS wins
Installation Difficulty - TVS wins (it's easier)
Uniqueness - TVS wins
Reliability - TVS wins
Not giving ZZP your $ - TVS wins
Blower Headroom - TVS spins reliably to 20,000rpm. GenV is kicked at 16,000.
Flow detect?
Whipple... how many people have a whipple setup? How many of those people showed gains from the m90 to the whipple with nothing else done?