Phew this is going to be macho racing for people that drive the M1A or GT40. It's brutal, the McLaren, both in terms of grunt and biting you. But its fast, very fast indeed, if you can keep it neat. Took my interlagos setup (which is online I think) and stiffened springs and shocks a bit and its almost as fast as a Crapi round here.
Need to be very smooth, feed the front in early, no late braking, then once the front sticks and you're pointing inside your exit line, hit the throttle hard and power oversteer out, or spin.
Very much the same with the GT40 but it's easier to drive, doesn't bite so suddenly, although it lacks power compared.
Choice will depend on concentration I think, McLaren is going to need a lot of it.
I see PR's posted almost the same - except he's gone softer. Who knows now?