318 build up
I dont quite understand the obsesion with bore size when it comes to the 318.
The much loved chevy LS1 has only a slightly larger bore size that could easily be matched with a slight overbore.
The 318 falls down on cam,compression, and port size. All easily fixable.
It has a slighly shorter stroke than the 360 so will make it's max h.p higher in the rpm band.