There are A LOT of options with the 7R case. I think your best bet is to get
Wayne's rebuild and Bruce Anderson's
performance book and start reading. In the end, you'll have a much better feel for what's possible and pretty good roadmaps to get there. You say it's a 73.5 2.4? Halfway thru 1973, Porsche moved away from 2.4l with mechanical fuel injection and started building "middies" with 2.7L and CIS. Typically, if someone posts they have a 73, it's a 2.4, if 73.5, it's a 2.7. It would help to post a pic of the engine and provide an engine serial number to determine exactly what you have.
I want to throw this out there that there's very little chance of doing this on a tight budget. Unless it's already been done, you are looking at a significant machine shop bill just to get the case and heads ready for reassembly.