I think it’s better to take the grill off but maybe could do it with just the radiator out of the way.. leaving the oil in might be ok too. I think the radiator and fluid need to definitely go
may try leaving the oil in and see if I can get the grill off
Mike, you don't need to pull the grill, unless you are planning a cam swap. Definitely drain and remove the Rad/cooling system.
When you scrape the old gasket on the block for the timing cover, fill the front of the oil pan with rags to stop most pieces from falling in. Some small pieces will, and after you button everything up, change the oil before starting.
Glad you discovered the cause of the oil leak! And repaired it yourself.
Timing chain - set the motor at top dead center "0" before taking things apart.
When you hit the Balancer bolt with an impact to remove it, make sure it doesn't move. If it does move it back. When you remove the timing cover, the marks should line up on the two gears.
Re-install... Put some white grease, light coating, on the balancer body that contacts the seal. yes you can assist the Balancer back on with a block of wood and a dead blow hammer, but beating on it is not advised.
You have my number if there are questions... Doug