1970 Volkswagen Beetle Clutch problems

Transmission problem
1970 Volkswagen Beetle 4 cyl Two Wheel Drive Manual unknow miles

I Have a vw 1.3l motor whic we converted to a 1.6l. We put the car into a beach buggy. The problem is 2nd gear, every time you put it into 2nd it grinds, it also pops out of gear at times. The other problem is that whenever you release the clutch, the car revs up by itself, any help would be appreciated!