I would agree if its a street car...build to run 93.....unless you dont mind paying for the good smell..
On the boats I have ....I have run many gallons of 93 thu a blown 502 running 6lbs of boost @30 degrees of timing ...locked.....The static cr when I started was 8:1 ....I ran that boat for over 100 hrs with no problems....and boat engines work a lot harder than any Cobra engine ever will.....
The new boat I have has a blown 468 with a static cr of 8:1 ...runs a bit more timing and has 12 lbs boost......I just bought fuel for it tonight and VP110...was $6.95 a gallon......
If you wanna go fast....ya gotta pay....