Glad to hear your back on the road. Here to hoping the heli-coil provides with many trouble free miles!
On a side note regarding engine replacement. Coming from the world of the Rover V8 where head gasket jobs were as common as timing belts on the 2UZ, I have a hard time understanding trashing a whole engine for such a repairable issue. I understand that time = money, but good 2UZ's (especially Japanese built) are getting harder and harder to find it seems. Buying a used engine is also quite a crap shoot it seems unless it's local to you and inspectable. Of course repair or replacing the head also makes more sense if it's something you can do yourself at home vs paying a shop.
Just my 2 cents, and some random thoughts.