“Max effort daily driver” 318 build vs “Budget” 400 swap

funny that you mention
Well isn't that a hoot;
My cam talk is/was based on an advertised taken at .008Tappet-rise. Whereas the Comp is taken at .006, making it measure advertised bigger than a .008 cam.
In other words, the 218/[email protected] that I recommended, when converted to .006 could easily be a 218/268 @.006,
therefore;
you and I are on the very same page; Nice engineering Charlie.
FYI
Just so you know;
With alloy heads at .028Q, and a Dcr up to 9.2@ about 195 psi,, I have always run my 367 on 87E10; with full-timing and absolutely no sign of detonation. My all-in timing has been delayed to ~3400rpm, just cuz I ain't taking no chances, and my butt-dyno cannot tell the difference anyway!
Your 318 combo is looking good.