T16 Engine

[fly fisher]

Hi,
I have a Morgan +4 with the above engine from 1996. Being new to this type of engine, is there any good improvements one can make as well as maintenance advice? I have already fitted a K&N Air Filter but otherwise its standard.

I take it 10/40 Oil is best for it?
Any tuning upgrades or low cost remap's available?
Whats the best way to reduce tappet noise? I understand this is pretty standard on a cold engine. (It even gets a mention in the Morgan handbook)
Is it worth upgrading the HT leads?

Any other advice appreciated.

Thanks,
Will