I never tried octane boost, so I'm not sure. I used to run 101 and 105 octane until I switched to 7K3 heads. Now I run on 91 octane Super Unleaded and me and the car are happy campers.
For what it's worth .. and remember, when it comes to free advice you get what you pay for ... If you have to use one of those two sets of heads on a 455, try to find some way to enlarge the chambers on your #62 heads. Open them up to about 90cc if you can. That's a lot of unshrouding around the valves, cutting away all the sharp corners and opening the chambers up all the way.
Ten years ago I was right where you are, looking to put 72cc heads on a street driven motor. I even had them ported and opened up to about 84cc hoping it would help. After driving the car that way for a few years, I started looking for new heads to drop the compression.
Anyway ... that's my $.02 worth. (Can someone PLEASE tell me why a typewriter has a "cents" symbol buy my friggin computer keyboard doesn't?)
