who runs 13sec to 12.80 in the 1/4

A360 said
I believe (could be wrong) that the US octane rating is different to Australia's

So our 98 could be 94 for example to you.

This would be correct, the ratings are different on the same fuel.
What size cam and tires? Have you changed the converters out?

DusterBoy15 said
so i guess what i have to do is find what compression my pistons are and shave the deck and the heads

What year 360?
You'll need not more than 9.0-1 to run the time.