Mark,
Awesome to see those photos of the Gilmour/O'Rourke Jag (and your 356!). Love to see any photos of 227 that you might have.
I learned from Nick and John Dabbs (the builder of my car) that while the two Jags were supposed to be similarly equipped, Dave and Steve had actually utilized a 4.2 liter motor instead of 3.4. They had even gone to the trouble of grinding the castings off the block and making "new" ones from epoxy to make it appear to be a 3.4
Of course, there was some sneaky stuff on 227, as well