Hi! Which country are you in? Here in Britain, we have got several good guinea pig rescues that rehome only well bonded and healthy guinea pigs. I can also give you some names for the US and Australia, but not every state has got a good rescue. If you only have got access to baby boars, you have to face the risk that their personalities may turn out incompatible when the testosterone hits between 4-14 months old while they are both going through the same unstable phase. The key to a boar bond is character compatibility.
https://www.theguineapigforum.co.uk/pages/guinea-pig-rescue-locator/
If you are worried about fall-outs, it wouldn't be a bad idea to go for an adult pair of boars that is past their teenage hormones and generally much more stable. Alternatively, if you can find one, you could consider a neutered boar/sow pairing - they are the most stable of all pairings and you still get at least one boy!
This thread here discusses the pros and cons of each possible pairing; you may find it helpful:
https://www.theguineapigforum.co.uk/threads/boars-sows-or-mixed-pairs-babies-or-adults.108944/
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