/6 rebuild advice

Decided to do an exhaust gas test on the coolant. Noticed with a warm engine and with the cap off, I got a couple good bubbles that burped out the radiator neck. Expansion / contraction without an overflow bottle - maybe

Blue stayed blue so no exhaust present in the radiator…. I think the coolant is flashing somewhere though….

…… I thought the smog pump was an AC component. Glad I looked that number up. ️TRASH!

So far cylinders and head gasket appear
In good shape.

Thermostat next….