Bosch pint ignitions should give a strong, bright purple spark when set up properly.
Did you replace the condenser? Check your grounds too, make sure they're clean and solid. Make sure the plug boot has a good connection with the wire, same with the wire to the HT coil. Screw it in snug. If its loosey goosey, unscrew it, snip the ends so they're fresh and screw it back in.