R1 carbs with major work to them, a full race manifold with home made system ( im a welder+fabricator by trade) and loooots of time on the rollers

surprised the chap who set it up as he said the motor is super strong and wants the car back to raise the rev limit cos he reckons he can eek another 10-12hp out of it as it just keeps pulling. The chap builds race and rally cars so he knows his stuff