L28 Front sump conversion

[jeffer949]

Im building a l28et and im converting it to front sump. I've already drilled everything and I know what im doing there. Wanted to run how im sealing the oil galley off.  I the picture you can see my new pickup hole and dipstick hole. I have already put a Welch plug to the left of the small hole and plugged the old pickup. Next im going to put the aluminum plug i made that has a npt plug inside of it between the new pickup and dipstick hole. When I tighten down the npt plug it will spread the outer wall of the aluminum plug and seal it off. I will theb back that up with another Welch plug.  Im almost sure it will work but I wanted to get some more eyes on it to make aure. Because if it doesnt work. Ill suck air  and take out the bearings.  Any recommendations on a sealer I should use if any?