Heh, heh, I too have a leaky sump gasket. When I was out getting all my parts for a service, I found an interesting old kit under a pile of gaskets. It was on clearance for $3.25, and the label said "to suit 4-cyl Datsun". I grabbed it cause it looked like it may fit the Z24 and I despise making gaskets. When I was up paying for all the gear, the cashier said the gasket was actually on clearance at only 25 cents. Getting it home, it turns out this gasket will be a perfect fit with all holes in alignment - bargain.
I reckon dropping the pan off shouldn't be too hard, but no doubt a lot of skinned knuckles for me. There looks as though I'd have an inch, maybe that and a half at best.