Anyone serious about quinella betting MUST get hold of a booklet by Malcom Knowles called "Quinellas."Obviously for copyright reasons I cannot tell you any more,but if you can still get hold of a copy DO SO.
Tony is right about betting to prices,the simple box is a definite NO NO!There are serious overlays to be had in the quinella pools.
Go to inracing.com.au you can contact Malcom there.