As has been noted, 10k is not realistic for a RHD 240Z anymore. And even if you could find one for that, you would be looking at a considerable investment in time, skill, and money to address the inevitable rust issues.
As Chris says, an alternative is to look at LHD import project cars sub-10k and RHD convert if that is an absolute necessity. Conversion panels are available although you still need to track down used parts like dash, pedal box, heater/blower, steering rack, etc.
You need to do a lot of research and get a clearer understanding of what’s out there, what things are worth, and how that sits with what you want - and whether it’s viable.