Make sure your new manifold is port-matched to the gaskets before you fit it.
Make sure you fit new manifold studs, good quality plain washers and the correct peened nuts, not nylock.
Fit a new genuine stat.
Buy new water housings unless you have good quality, relatively new ones - they go brittle and will crack given the opportunity.
Fit a new cambelt and tensioner, if the bolt on the end of the crank has been undone, fit a new one and torque it appropriately.
Don't take the M6 rocker cover studs down past the specified torque or you'll distort the rocker cover and it'll never seal. Use a 2.0 rubber gasket, not a cork one.
Take the dizzi out and get a drill on the oil pump shaft and bring the oil pressure up that way.
Turn it over by hand before you try starting it - make sure it turns over smoothly and nothing contacts.
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