Nice car. Have you considered these things?
- Baking Soda eats the plates readily
- PVC begins to soften at 140*F
- PVC fumes can harm catalytic converters and 02 sensors
- Baking soda turns into NaOH which munches on aluminum. Baking soda can also do this by itself.
- How will you keep mist and electrolyte out of your engine?
I love those cars and would hate to see it get F'ed. Also would hate to see the face of the unsuspecting consumer who buys the car later down the road with aluminum damage. See this thread:
http://hhoforums.com/showthread.php?t=1426
And view the chemical compatibility chart for aluminum here:
http://www.coleparmer.com/techinfo/ChemComp.asp
Sodium Bicarbonate is not recommended.