my silly opinion
welcome!
....I have to make this one observation whenever someone talks about 'all that power' and 'stress' and TBO etc.
the 180 hp 0-320 is going to be at 2700 rpm, right? How many hours of the TBO is spent at that actual power setting?
average flight?, 60 minutes.
take-off power....., before dialing back the black and/or blue knob? maybe a half-minute?
So you are really stressing all that stuff for about 5 or 10% of it's life....somehow, I don't think that is going to cut the TBO in half!
( meaning, somehow, you are DOUBLING the wear on the innards?)
Yes, detonation and other concerns are valid, so you need to control the ADVANCE, not just the C/R.
lots of smarter folks than me will guide you in the right direction, but most will likely say, why hot-rod an 0-320, when it's cheaper and easier to do a similar rebuild of an 0-360, using light accessories.