Previa In-Car Head Gasket Replacement - Will It Ever Run Again?

This is the most major auto repair-tainment I have attempted yet - my first ever Head Gasket replacement. At 297k miles, I am not really risking a lot by giving it a try at my own repair success - the 1994 Toyota Previa LE SC AllTrac has had a long and useful life as our family's beloved Floki, the Super Car Adventure Van.
I was only able to remove and install the new Head Gasket by following along to Sammay's KZbin expert videos for his in-car engine lowered technique. Be sure to click over to the following KZbin links for expert instruction if you are to pursue the Previa Head Gasket project on your own:
Sammay, Previa Legend: Provides many step by step Previa repairs videos including AllTrac (AWD) conversion, SADS couplings, Head Gasket, Oil Pump Cover O-Ring, etc. Sammay is my Go-To Previa repair online expert:
/ @previalegend
ToyotaTarago1992: This channel provides many informative and instructional videos for Previa repairs - including this single video composition of Sammay's Head Gasket videos including additional instructional edits:
• Replace a Cylinder Hea...
AGAIN, the above two KZbin channel links are the EXPERTS. I am just auto repair-tainment and honestly, by the time you are seeing this my Previa head gasket replacement may very well have already failed...
So far so good though - I have now covered 125 miles including sustained highway driving 65-80 mph with no issues. But I am running through a full tank of gas before going for it all with the pedal to the floor - stay tuned.
Thumbnail Title: Previa Mayhem 3 - Head Gasket
Car: 1994 Toyota Previa LE SC AllTrac
‪@jamiecars‬

[@kurticusmaximus]

I’m glad to see this job is doable for the average Joe. I replaced the neglected 200k engine in my Previa with a low miles JDM engine years ago. Prior owner thought running straight water in the cooling system was a good idea 🤦‍♂️

[@Liazon098]

Congratulations 🎉 👏 Glad you got all the gaskets done.

[@jamiecars]

Me too!

[@JohnnieFoxcsm]

Thanks for the video. this is super helpful. I'm about to do this on my own van. thanks for the video from a "less" experienced viewpoint. Any new thoughts for someone attempting this repair? Did you check the valves for leaks?

[@jamiecars]

Thanks! Only visual on the valves - did not have any leak tests. With port fuel injection, I am not aware that carbon build-up is an issue for Previa engines. My valves looked great and the engine has always run well - even with the slightly damaged head gasket for several years. :) Jamie