Most of the time the oil leakage around the head gasket joint is because the barrel spigot is too tall, and prevents the head from seating down on the head gasket sufficiently to seal the oil around the pushrod tunnels.
In cases like that, no amount of re-torquing will fix the leak. However, a little measuring of the gasket gap between the head and barrel, and a gasket that is .010" thicker than the gap, will fix it. Or, if you turn down the spigot enough so that the gasket gap is .010" thinner than the gasket you plan to use, then it will seal.
As for the porting, the port is already big enough for 6000 rpm, and all the gains for that port will be in the valve seat, unless you go to bigger valves and know how to re-shape the bowl properly to get gains from it.
Take it from a guy who has a LOT of Bullet cylinder head work under his belt.
And if you plan to ever have it ported professionally, like by us, then leave it alone until you want to send it in, because sometimes we can't get the best results if metal is removed where it wasn't supposed to be removed.
This port retains the 32mm entry, but has 1.84" intake valve with narrower stem, with re-shaped bowl and special 5-angle valve job done on a Serdi machine, with custom guides, and will receive a custom hand-matched and flowed inlet manifold stub pinned on those pin-holes you see in the photo.