We're all on the same page
Olderdan,
Yup those look like the gaskets that I use although I still prefer to mount the carbs using the original Cleave-Lock nuts with a plain flat washer (not the rubber backed washer) - Not really much different but to each their own I suppose.
Tonyfoale,
Unfortunately, oversize slides are not available. My guess is what size to oversize them. They did chrome slides for a few years to avoid the galling action but found that with time the chrome de-laminated and would be sucked into the engine. Anodized slides are sold as replacements and also used on the new replacement premium carbs (including a removable pilot jet). Amal ad re: 600 series Premiums follows though 900 series also available:
"As a further step in the improvement and development of our carburettors we are now offering special light weight versions of our 600 Series Premier carburettors with the body and float bowl cast in aluminium. The carburettors include all the parts developed by us for the Premier carburettor – hard anodised aluminium throttle valve, ethanol resistant Stay-up float, removable pilot Jet and aluminium needle valve and have been comprehensively tested on the road and have already clocked up several trials successes.Genuine AMAL jets guarantee accuracy and consistency of performance.
The aluminium carburettor offers a weight reduction of around ¾ lb over the traditional zinc alloy type."