if you have clearance issues with the oil filter on the engine mount, you can just cut the corner of the mount off with a hacksaw or angle grinder.

A better way, if your block has provision for it (I think the L20B's do) is to get the 90 degree elbow to mount the filter upright alongside the block. I think they came off Stanzas - or it might have been Bluebird. Not too sure now - too long ago. if your block has 4 tapped holes around where the filter goes, you can fit the elbow.