High output alternator recommendations

I recently went the route of adding the Holley Sniper EFI, Hyperspark, & a in-tank fuel pump to my 1969 Dodge Dart w/ 360. I believe I'm at the point where my stock alternator is not producing enough amps to keep up with these new electrical components I've added (albeit I'm having a hard time finding the exact amp usage these systems are using via online). The car only registers about 11 volts charging on my volt gauge event when I'm at 4,000+ rpm. I'm starting to look into upgrading my 55 amp alternator to this 100 amp 1 wire alternator:

CHRYSLER Top Street Performance ES1013BK Top Street Performance Alternators | Summit Racing

Are there are other alternators I should consider? Is there a good reliable way to tell just how much my entire system is using in amps?

If I do upgrade my alternator, what do I need to do as far as wiring my volt gauge so the new alternator doesn't fry it?

Apologies for all the questions, but I'm sure I'm not the first person to be under powering their electrical components in their car :)

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