I use 10w 40 whatever semi synth is on special and change it before every track day or 5000k, it never gets to 5000k though, only spend money on things you will be using with your new motor though, a sump vent is good, reason being alot of heavy plant use then to reduce sump pressure which in turns allows the engine to rev easier as its not trying to push against positive pressure.
Mine runs return to sump catch can, head drain on the hot side, vent to the cold side and a remote restricter set up which is a story unto itself.
As long as you can control the flow to the head you should be fine, me if I was you, with your Tomei pump I would keep VCT?, block the front and use 1 x 1mm restrictor at the rear like in the Sydney kid thread.
I would fill it 1 ltr over full, and then check the can regularly for oil.
I wouldnt do any other mods as you will not be using any of the parts on a 26 build.
Then trash it till our new motor is ready.