If the previous owner replace or just took the head off check your timing it my be off a 1 or 2 teeth it makes a big difference
change the wires(i think you did) and spark plugs . As for the dizzy it should be k you might have to change a wire around or something also if it sputters then take the fuel filter out and and blow in it it might be clogged up let me know was up bro.