Just check that the crank sprocket mark lines up ok when the cam sprockets are in tune, if ok and spark is as above things should run ok, check carb balance, as a guide, if you get backfire that carb will be a bit lean.
also check that carbs are not flooding and fuel pump pressure is ok.
a quick spark check is to connect your strobe timing light to each lead in turn, if no strobe there is no spark.
this should do it, I had very low compression but engine ran ok you need to look elsewhere.