I have solved other problems but now I ran into another.

Car doesent have power and cant really climb even smallest hills. Moving gas lever from half way to full doesent make any difference. Rods are moving and carburetor also. So is the problem that engine cant get enough fuel?

I have routed the fuel line near to the body so its little bit more away from exhaust. Does that effect to the pressure? Can I replace original fuel line with fuel hose? Or should I put in a small gas pump with regulator?

Don't use a hose and don't use a fuel pump.

First, I'd check the vent hole in the gas tank cap. Then I'd check the fuel flow at the carb. It could easily just be that the screen in the bulb needs to be cleaned out.