I know this is probly already done but have a look for exhaust leaks and also make sure you have the plug leads on right. You are not being very clear about what is wrong. It sounds like you just don't like the sound of it running and no doubt it also is running like crap but you know it fires on all pots. Is the vac advance on the dizzy ok? Just go through all thwe options and you will track down what the problem is eventually.
Replace as needed all sparky bits from dizzy to plugs... Can't hurt to do it.