so you reckon i change the entire engine? that'l be quite an expense! what unreliability would come with a carb swap? what gains would be had from gas flowing the head or fitting a high-lift cam?

I know, a sacrifice has to be made-one for the other, but if i have a problem once in a blue moon with a slightly modified engine, i dont mind.

I also wanted to change the gear box to a 5 speed... will this add to unreliability?

thanks for your response by the way...