Hey peepz just dl-ed this rom and played it on Nintendulator.
It's just mario lost levels (the FDS mario 2)

Can anyone help me getting this on a nescart?
Can I use a mario 2 or 3 cart?
If so, please help me out!
What Eproms should I use?
and what pin is connected where?
I am pretty good at soldering and such so it should be no problem if I get the right instructions.

If you learn to read the ines header, you can determine the mapper and the size of the CHR and PRG.  If you google ines header, I'm sure you can find that information. 

There are also board lists floating around somewhere which say which boards are in which games.  With the mapper information from the ines header, you can determine the board once you've taken the time to familiarize yourself with NES boards.  Take a physical look at the cart you're going to use and you'll be able to see how many pin eproms you will need.

search for "Nes Rom Pinouts" on the main page of nesdev.com for a document about the pinouts.

Good luck!