Lampy Mate,

You will probably have to roll your own exhaust up as I don't think anyone stocks them (unless you buy from bprojects), I'm rolling my own up. Although my alignment (1200 extractors) fouled with the intake manifold as well as the engine mounts and the firewall belly (too close).

The A10 should be okay with it all, I would say turboing would be bring some issues. Carbs should be fine. Throw some double valve springs on and that should help you get the revs that you want.

Well, having three bearings wouldn't compare to 5 on the later A-series models. Give it a go, in the meantime grab a spare engine in-case things do go wrong.