What pulleys for manual steering 1970 duster v8

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StimsonGarage

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hey guys so I recently installed a cvf vbelt water pump pulley and crank pulley and alternator bracket on my 70 duster. My issue is the crank pulley is too small and causing my voltage to be low at idle. What’s the correct crank and water pump pulley combo I need. It’s manual steering too. Part number and website would be awsome thank you. Here’s a pic of my engine
 
I'm wanting to say the factory steel one is 6-1/2 to 7 inches, and it uses the same size on the water pump. Correction, 6-1/2 inches. Larger ones are usually multiple belt a/c pulleys.
 
How long do you let it idle? If it does not over heat there should not really be a problem.
If the voltage goes below 12.6 ah maybe 12.2 at idle it may be a weak battery unless you have some accessories on.
It looks nice, you spent the bucks, so if it is not broke don't fix it.
 
How long do you let it idle? If it does not over heat there should not really be a problem.
If the voltage goes below 12.6 ah maybe 12.2 at idle it may be a weak battery unless you have some accessories on.
It looks nice, you spent the bucks, so if it is not broke don't fix it.

I put my old crank pulley on thats about 6inches wide. Had the belt just run the alternator and crank and voltage stayed steady at 14. So it’s definitely pulleys. I’m gonna order the ones the other guys suggested
 
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