check all the connections. and grounds.

Ok so I have a 77 hawaiian with bbf 460. Last year when I put it away it ran fine I recently tried to start to get ready for boating season ( live in iowa soo lol )  anyway I have no spark while cranking the motor over but as soon as I turn key off it will for hard once. Anyone have any ideas lol I replaced ign switch. Ballast resistor. coil ....I'm stumped

Maybe try a temporary hot jumper to the coil, but put it on so you can pull it off to kill the engine.  Since you state that their is a ballast resistor, are you running points type distributor?

Anyway, if it can start with the jumper,,, either the ignition switch or wire from the switch is bad.  Note that the starter cranking terminal on the switch is separate from the "run". 

Ok so I have checked everything a million times lol.  I do not have points I run a mallory unilite which photo optic timing or let either way no points. 

ok so lets get this straight !   as you crank the engine over you get no spark but when you let off the starter you do???

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Correct but but not when you stop cranking its when you turn it to off position lol very crazy I know

ok without being there or having you check things while im there or on the phone i do believe you have a ground issue. which is really a open. its time to start from the batt and work your way up.  will start with check that you have 12 volts at the batt, then make sure you have that at the key and  at your starter.next with the key in the off position (using a test light ) see what poles have power and which ones do not.none should have power except the batt pole. ok now turn the key to the on position.with  that done now check that you have power (12 volt) on 2 poles on your starter switch.you should now also have power to the coil. 12 volts!!! NOW here is where its gonna get tricky with just one person. turn the key to the start position!look for 12 volts if you do NOT have 12 volts to your dist! check it and double check it!!!! electrical can a real pain cause it may work for a second and the next not work. good luck and let me know!