1. Replace like with like - simplex kit from Bully (and get an oil thrower from Mini Spares)
2. Upgrade to a duplex , again kit from Bully
3. Keep the Simplex and fit a timing chain tensioner.
Which is the preferred option? I realise there may be some differing opinions.

If I go for option 2 or 3 do I need a different timing chain cover?
And stupid question - do I need to drain the engine oil before removing the timing chain cover??