Head Gasket Scope Creep

[LostinSpace]

Hello all! First post here

Picked up a 2010 Yaris with 185k on the 1.5l for a really good price, auto unfortunately for now. Purpose of the car is to be a reliable daily with good MPG. Possibly tasteful mods in the future.

There is a small bubbling of air in cooling system, I did do a head gasket dye test and it passed with no change. My understanding is that there is pressure in the cylinder leaking past the head gasket into the cooling system.

From doing some research I have come to the conclusion that it will be easier to just drop the engine since the timing chain cover has to come off.

The engine runs great so I have no worries that the motor is healthy, would it be better to consider buying a junkyard motor with less mileage and swapping it in? I have one local to me and would run about $450.

Anyway I was hoping for some suggestions of preventive maintenance items that would be easy to do while I am in there.

My current list is as such:

Head Gasket: 1111521091
Valve Cover Gasket: 1121321011
Crankshaft Seal: 9031125032
Thermostat
Water Pump
Oil Pump Seal 1: 1149721010
Oil Pump Seal 2: 1215121010
Toyota Genuine Seal Packing (FIPG) 103 Liquid

Thank you in advance!