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The GM 3.9l V6 engines have the same front cover as the 3.5 V8 with the uprated oil pump as standard fit. Cover is a straight bolt on to the V8 engine.
Then you should be good for oil pressure and volume.

You mean the Buick 3800 series right?

Many T-type guys have actually installed Rover Suffix B front covers because they supposedly provide more reliable pressure.

 

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I'm not sure what you call them over the pond, but in SA they were in a limited edition Opel Commodore V6.
Basically the same castings as the V8 but with 2 cylinders lopped off the back and iron versus ally block, cam in the valley, not the heads.
I think you guys referred to it as the odd or even fire engines?...

The Buick "Fireball" V6 fired like the 215 V8, and hence always felt it wasn't running right. After 1967, the Chevy 250 took over on all their cars, and tooling was sold to Kasier-Jeep who used them in the CJ-5 until 1971.

During the oil crisis of 73 a group of Buick engineers went to a junkyard, and convinced their superiors to buy the tooling back from AMC. 3 years after returning to the market, they redesigned the crankshaft to make it "even firing" and bored it out.