does it have spark when it wont start? if not, turn key on and off repeatedly and see if it sparks when you turn the key off. if it does not spark when it wont spark and it does spark when you release the key, at least try the ground cable. even if it sparks but it is weak (yellow and short). if it has good spark when it wont crank let me know if it has a standard HEI distributor or an electronic spark advance distributor. (HEI has a vacuum advance).
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