The Stovebolt Site Forums The Shop Area Engine Shop Oil on fuel pump

I'd replace the fuel pump to block gasket 1st then monitor.

There's alot of pressure and oil misting going on in the bottom end when running and escaping pressure will find a way to get out.
You did good to clean the draft tube out but it relies on air flowing past the angled slot cut in the end to help make a low pressure area that helps to draw the pressure out. If you want to keep the extension on the draft tube you should cut the end at a similar angle as the original end to replicate the drafting it provides.
It's also SOP to get some oil drips out of a draft tube.
There's all sorts of baffles etc in the draft tube to cut down on the drips but some will always follow the pressurized air out.
Good luck
Dave