333882 heads?

My crappy heads on my 70's stock 350 are junk!
3 studs pulling out.
350 trans and 3:36 rear with p-215x14" tires on my 65 Caprice.
I have a new stock cam and lifters and a pair of 882 heads.
Please tell me about the heads and how well they will work.
Compression is good.Average 125.
I've been chasing a vacuum problem and suspect the heads combined with a worn cam and intake gaskets are causing it.So,I want to fix it all at the same time.
Thanks for any help,as I'm not up on all this type of repairs.
Mike. :)
 
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