Hello everyone
Had another play yesterday and made a discovery - I am an idiot
It seems while playing with the idle screws I had been turning them the wrong way and leaning out the mix rather than richening it up
Reset the carbs yesterday and it now runs a lot lot better although it still has the odd pop and bang on the overrun but that is probably an air leak. A wideband lambda is on the shopping list for tuning. I popped a CO meter up the can and at idle I was getting 1.5% CO.
For purely educational purposes I checked my shift lights were working as well -
http://www.youtube.com/watch?v=SBZ497TwyII
On the temperature front I've been through the cooling system again and rebled it all and the engine now sits happily at 89C with the fan cutting in and out so it looks like I must have had an air lock somewhere.
Thanks for all the advice guys. I've whipped the exhaust off at the moment topolish it and wrap the headers in the engine bay so when I get it back on I will report how things are going.
Cheers
Dave