Sure it may idle great but if you have the timing set at 25 or so and the distributor is set up to only run 10 degrees initial advance there will be too much total advance. Good bye head gaskets or youll end up with tuliped intake valves from detonation then blow a head gasket to boot.
I would check that piston is really at TDC when timing mark is on zero.
I would use a timing light too. Once you have the timing adjusted correctly start tuning on the carb.