On a fresh brand new rebuild your telling me you would run 19's and +4 and still continue to run 93? What if the compression is 205, would you still run the 19's?
I see where your going with this, but I wouldnt run 90oct on +4, whats the extra say $1.00 on 5 gals. I would want it for the extra octane for the protection factor more then anything. But with that being said I did run 18cc domes on my stock motor with 91 octane, the reason was because the top end was so shot, I still was only pulling 70 lbs of compression! But thats besides the point would I do it on a fresh rebuild, absolutely not.