forgive me - winterizing question

I've winterized the 350 chevy in my last boat for 8years by the method below, however need a little advice on winterizing a GT40.

method:-

run engine up to temperature with hose fitted upstream of filter bowl.

Once at temp, shutdown and connect up a barrel of 50/50 antifreeze mix, run this through engine until I can see antifreeze exit exhausts.

Fog carb until it stalls, remove and oil cylinders, rotate etc .

My nautique hsa a GT40 injected engine and I am not familiar with any differences in thw winterization procedure. I have never needed to drain the block, instead I prefer to pump antifreeze in and let it circulate, I assume this procedure can be replicated on the GT40? The intake on the GT40 is dry so I guess I skip the fogging and go straight to spraying through the plug holes into each cylinder.

I've not detailed lubing, greasing, oil changes etc.

wouldn't I then run the risk of the t'stat closing down in the time it takes to drain the engine? Then, possibly the antifreeze mix does not get to all parts of the engine?

The thermostat blocks the water from leaving the engine. Even if it is closed, the antifreeze will fill the block and then by pass into the exhaust manifolds, as long as the block has been drained.

I have a friend that used to run anti freeze through without draining and he cracked his block. His thermostat must not have opened.

You don't know that the water is out of the block unless you drain it.

I have always just drained the motor and pulled all the drain plugs. never used antifreeze. in 12 years I've had 1 frost plug pop.