You can drill K-blocks so they'll accept squiters. There is (or was) one of the jig and drill kits doing the rounds in OZ, which IIRC John V (JVAB Imports in the US) originally put together. Not sure where is it at the moment though.
OTOH, L-blocks are already drilled, and most L blocks after 1993 (with round tooth timing belt) have them fitted. In both NA and turbo versions. Earlier L-blocks have solid bolts in place of the hollow bolts and squiters.
The OP can use a NA L-block with squirters and just drill the block at the oil gallery flange for the turbo pressure feed, and again at the flange for the oil drain. NA blocks also tend to have a bit less bore wear than turbo blocks of the same vintage. I'm using NA L-blocks for my B230 16V +t builds.
