Advice needed on manifold repair

Brooks James said

I have very little in it, $150 to fix would be worth it to me

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You'd have more than that in it labor prep-time & materials, let alone actually welding & re-machining. I wouldn't touch it, 'cause I wouldn't steal Your money, it ain't worth it. There have been a bunch of good cast SB intakes here on FABO for that or less.
You aren't "giving up" on anything, You'd be making a wise decision to move on. If it was on Your Pappy's street racer & had some sentimental/personal tie to You, I'd certainly keep it...but still wouldn't fix it.
Good luck with Your call, peace!