i would think that if you could polish the intakes of the delortos up to the point where they mix gas and air might be worth a miniscule rise innower. ae you using velocity stacks? another one would be to rig up a aram air system for it. they can help out a fair deal at hihger speeds.

also try some of the exhaust wrapping on the exhaust extractors. it will help keep heat out of the intake charge. just my .02