Technical Cracked Cadillac 331 Intake Manifold

I noticed two cracks in my 1950 331 cadillac intake manifold where the nut goes over the studs.

Will a crack in this location mess up performance? This was noticed after a high rpm highway trip (which I was imobilized due to a broken U joint). Car doesnt want to hold idle and runs rough. Pulled plugs and they check out ok. I did burn like a half a quart of oil and the engine has sludge.

I notice a 49 intake manifold on ebay... Will that fit my 50?

 

The one on ebay is actually cracked in the same location....

You see its on one of the open notches.

Can i just have mine welded up?

 

With those big washers you got there, I wouldn't worry too much about it other than making sure you got a good seal all the way around. Don't overtorque.
Jack E.NJ

 

With proper heavy washer like in OP second pic it is not an issue..The link is only there probably for core/casting/maching support...

 

I got a 1950 intake if you need it. Make me an offer and shipping from 92253...

 

I cant see how the crack location would allow a vacuum leak so performance should be of no concern. It could be welded if you want.