SRV is just an RPM switched output, not sure if it is power or ground though. The OEM setup has a sense to verify open/close (I think), but not sure that is necessary. There is a power and ground as well, but those are separate from the PCM. The OEM setup activates at 4800rpm, not sure a dyno is really needed. Engine Masters did a show on the Eagle 5.7 and messed with tuning the rpm where it flipped and pretty sure it ended up being the same rpm as factory.
VVT just needs a PWM output, and supporting code. Best I can tell, version 1.3.0 from '14 was when support for VVT was added. And the solenoid is just 2 wires, power and ground.
So (in theory), only 2 pins needed to add both.
I would guess that a 6.1 intake gives up a little to the 6.4/SRV intake on the bottom end but pulls the same at the top. And I am doubting you will want more on the bottom end. So, I doubt you will ever want either VVT or SRV. Add that most aftermarket cams lock out VVT anyways so even if you did go to an Eagle later, there is a good chance VVT wouldn't be on the table anyways.
Plus SRV would require you to cut your firewall to fit it. You could run a 6.4 truck intake which has the SRV solenoid on the front, but the intake points up about 45 degrees to the passenger side so it would be kind of a weird setup in a car.
Either way, it was more a joke. My mind always goes to the "what-if", so I instantly got curious if there was room to expand. Not suggesting you actually need to add either one.
