Just my .02 cents, looks like a good job.
As far as sealers, when I do AL to AL I use aviation form-a-gasket.
Basically glues the parts together. Its the stuff they use to glue aircraft engine case halves together.Never leaks. Also a SOB to get off.... LOL
Usually on a oil facing surface you need to use the high temp red silicon if your going to use silicon at all. Silicone bonds and seals with humidity. If the surface gets too dry before the parts are joined youll sometimes fail to bond and get leaks. You also need full torque befoe it cures or it will squeeze out.
Like I said just a couple cents to maybe help out...
There are a lot of opinions on sealing and mine is just 1....
Dave