fuelpump clearence issue

Yes, you can take some of it off. I’ve never milled one down to the block so I can’t say you can take it all off.

IIRC you need to take somewhere around .200-.250 off to get the pump to clear. I take just enough off to get the pump in there.
i just looked at another 340 block i have and you can stick your finger all the way in and around that area behind the snub through the freezeplug hole its flat all the way so id say you could remove this snub all the way to the block with no issues