Let it warm up a bit longer on your drive before setting off
If you read the manual for the 4200 it says you can drive off straight away, no problem
But then read the manual for the F360 it says you have to let the engine and gearbox warm up for 10/15(?) minutes before setting off
It's the same gearbox! Even in neutral the gears are turning as long as you haven't got the clutch pedal pressed down so it will warm up when stationary.
Mine is notchy when cold as well even after being rebuilt.
Well as I said then; if this is the standard for the gearboxes then it's a function of the performance and capability of the technology available at the time.
Not the end of the world but compare to a modern gearbox built to handle that amount of power and you wouldn't expect the same compromise.
It is encouraging to hear that others find the box clunky when cold though. This is something I've heard anecdotally about Italian cars over the years and given that all other things work as I would expect had not worried unduly about it on my car although it is something on my list for the coming months to go over properly when I can get some time for it in the garage.
Obviously I'm gentle with the car upon starting but I believe that it's best to warm up a car through gentle driving not just sitting stationary idling as idling at a set rpm isn't very good for an engine. Everything will warm up quicker under load too which generally reduces wear. The gearbox improves drastically when warm and then performs well.
The standout gearboxes of the past (such as mgb, mx5 as already mentioned by others) we're typically handling much less power and therefore not pushing the boundaries of the available technology of the time whereas the 4200 was a very high specific output and torque for the period and the gearbox strikes me as a bit of a compromise as a result. Not a dreadful compromise though and obviously still (for me) the preference over a CC automated manual.
Now, if I had a CC I'd be much more inclined to feel the car needed warming before any kind of use as without any mechanical sympathy in the automated system I'd be having kittens every time I selected the next gear.