dog160,

An intercooler and fuel injection setup would be the very best thing to do for yours. Being able to apply 3D tuning to the motor will extract the very best out of the A series under boost.

Draw through is fine for the drags but, on a circuit intake temps are going to go through the roof and kill off alot of the power. You will find the first dyno run makes nice power but subsequent runs will be lower each time as heat builds. On the track it just gets worse.

Consider water/methanol injection kit if you are stuck with the carby setup to take the edge off the intake temps.