fred head hi octane

Octane boosters only raise the octane by like 7 points and they brag about it on their lables... what they don't want people to know is that 7 points is 0.7 higher than it was before the booster was introduced. that's pretty much the way 104+ boasts... and most of the other brands.
racing fuel is expensive but it works...
Or you can go to your local hardware store or paint supply shop and buy a gallon of toluene and add that in the right proportions to your fuel to raise the octane to a respectable level without breaking the bank or your engine... a little google searching on the subject should get you the right mix ratios. Alcohol or even E85 has more than enough octane as well but some serious rejetting is needed before your air fuel ratio will be even close to correct.
Another option to race gas is avgas, you can get 100 octane avgas from most airports and they'll fill up your 5 gallon containers for a fraction of the price of race fuel.