So increased over the Mod motor, which means greater than 100 mm. I have to ask does it share a bore spacing with the Boss motor? IIRC, the Boss motor will have a 115 mm bore spacing. Or will it be somewhere in between, meaning two completely separate engine lines? To me, at least, it would make sense to have the motors share a bore spacing.
400 HP in the Mustang and 360 in the F150 both sound like really good numbers.