Julian,
Thanks for the reply. The original Cleveland 351 in my GTS is set up for super (leaded) petrol and also as it has been worked over somewhat it can't run on regular unleaded. I have decided to go for the alloy heads as they are set up for unleaded fuel plus they have far better performance characteristics than the cast iron ones. Interestingly, I can get them relatively cheaply and only about $700 more than fixing my originals.
Thanks for the comment about the avatar image, I think one of the most interesting design features of the Longchamp GTS is that wide rear view.
Cheers, Stuart
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