I need help bad!!

I looked up the np435 gear ratios
1st - 6.69:1
2nd - 3.34:1
3rd - 1.66:1
4th - 1:1
Is this reason for the 3.56:1?
Are you experienced at setting up carbs and timing curves for performance engines? Maybe get it dyno tuned. I'd start with what Daredevil says compression test and check for vacuum leaks and don't take for granted if something new that it's good like coil, plugs, wires etc...
Start with the basic Fuel, Air and Spark and maybe more gear.