.
Good job on the Minnibago...
I put a XFI cam in my Metro and didn’t see a gain. In fact, it lost a few mpg’s. It probably needed a XFI ECM also, which I did not have.
Since you are rebuilding the engine, just go ahead and shave the head to raise the compression ratio a little. It will give you more low end grunt (same as the cam) without changing any other parameters.
Have a great day...
>
.