Okay, time for an update...
Cam case and heads apart, internals look great. Previous reseal used too much RTV or whatever it is. Scraped and scraped and used brake cleaner and compressed air. Victor Reinz head gaskets fit perfectly and IMO are OEM quality made in Japan. Replaced all of the small rubber coated metal gaskets on the cam cases with Subaru OEM (the old ones were gunked up with RTV and I advise any reseal to replace these little suckers. Head bolts are fine and reused after cleaning them and holes. Don't forget to use a tiny bit of oil on the bolts!
Existing timing tensioners felt fine but replaced with Subaru OEM. The existing idler pulleys feel good, no play in the bearings, smooth, not tight or loose and not noisy (keeping my fingers crossed because these are NLA and I'm not taking them off). All new Subaru OEM cam seals, o-rings, oil pump seal and MM gasket. I'm using Gates Premium Power Grip timing belts. I had 3 sets to choose from, Gates, Dayco and Beck Arnely. Through RockAuto... Beck Arnley seem to be flavor of the day, they are not a manufacturer, so they supply whatever fits and sent me 2 different brands, stupid. one was good, the other was an old dried up Subaru OEM that felt like a rubber band before it snaps! The Dayco are good, but the Gates are better IMO (Made in USA).
And, once again and again, Subaru parts websites mislead me. I had to return head gaskets, idler pulleys and a water pump. These parts are NLA for the 2.7L, so their website needs to be updated and managed better (I can understand that it is also my job to investigate thoroughly, but the diagrams are too vague).
I have an Airtex waterpump coming tomorrow, then we can continue the reseal. I have a new gasket and o-ring for the metal pipe and a new Subaru OEM thermostat.
Other new Subaru OEM gaskets going on are valve cover and grommets, front and rear crank seals, oil pan and separator.
I have new Subaru OEM upper and lower radiator hoses, inlet/outlet heater hoses, and some PCV hoses. The transmission cooler hoses look bad, they will be replaced with off the shelf hose, no big deal.
Also, I have a complete tune kit ready, using Bosch, Intermotor, Mitsubishi, NGK and Optima yellow top. Don't forget to re-do your grounds in the engine bay, they are all corroded and exposed at the connectors! I used a dremmel to clean the contact surface, cut and crimped new quality connectors and used heat shrink and shiny new hardware with a bit of battery grease.
Keep all of your old parts for... I don't know, just hold on to them, they are rare.