Clerics are weak blasters until they get Flame Strike, unless they're fighting undead. Eldritch Disciple from Complete Mage fits the job description for a healer/blaster, but the payoff doesn't really come until mid levels.
So the real options:
1. Archer Cleric with Spell-Storing arrows holding Inflict spells. (no VoP)
2. Cleric with Magic Domain blasting with wands until Flame Strike. (no VoP)
3. Play an Archivist (Heroes of Horror) and learn blasting spells from cleric scrolls of domain spells. (no Cleric, no VoP)
4. Forget blasting and go buffing / battlefield control. Beguiler or Dragonfire Bard can do this and still heal. (no Cleric, though Vow of Nonviolence works for Beguilers)