2.25 petrol advice

Looking for some advice for sorting the running of the 2.25 in my 80”.

I have an new Accuspark, electronic distributor, new HT leads and new Viper coil along with new plugs.

the issue I have is, there is an extra crossmember welded in the chassis for recovery point so I can’t get anything through the chassis hole to connect with the dog gear for turning the engine.

what socket or such fits over it all so I can set the timing and also so I can safely rotate the engine to set valve clearances.

It’s a 901 3MB engine.

Put it in top on level ground and bump it along with your knees (its ok to go backwards as this takes up the backlash)

The 3MB starter dog is a 1" Whitworth, or as Rob said you can move the whole vehicle in top gear. With the plugs out you might be able to turn the engine using the fan belt - this was how I used to gap the points before installing electronic ignition.