vh com building strong mild 6 advice please

My 17 year old son has decided to stay with the 6cyl 202 in his vh slx 4 speed manual... the current motor in his VH is a blue 202, its a smokey old stinky thing with issues and will do for now... he has just bought a black carby 202 with 83k kms... with this black 202 we want to build a nice strong mild engine that will be good on the current running gear... luv to hear your advice... come on you 6cyl people suggest your specs... cheers

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