318 heads on a 360

I believe;
and while my tests were NOT accompanied with time-slips, the stop-watch doesn't lie.
On the street, in a well-packaged streeter, power at 5500 is NOT the be-all/end all.
The bottom end can easily be pumped up with gearing.
But the midrange is where it's at. With a 360, it is easy to make plenty of midrange. Easy even to make more than the chassis can handle.