The driver side upper stamp steel block mount is wider or narrower, CRS, than the 318 are. I have seen guys using washers on the bolts as shims, but I would rather buy the correct mount and not have to worry about the nuts coming loose or the shims wearing and getting loose
The 360 is externally balanced and should have an external balanced balancer on it and the torque converter have weights welded onto them for external balancing also