Good point, Crazy Dave, as we don't know the provenance of the OP's jib.
Which makes it that much more important to think twice before modifying their deck hardware layout, if they're accommodating a jib not properly cut for the H26/260. Better to bite the bullet and get the right jib (if that's the issue), before poking new holes in the deck.
It certainly does make it important, on a boat rigged as the H26/260 is, to know just where the clew is on any replacement jib, since the sheeting block is in a fixed position that doesn't leave much margin for error.
Also, in case the OP is trying to increase sail area, my research has always shown that on a rig like this, you need to look at e.g. asymmetric spinnakers, etc., rather than try to increase the size of the jib. The rig doesn't seem to support or benefit from big genoas on the furler, even if you address the sheeting location challenge.