My take on it is to upgrade the primary cabling from batt to starter to ground, etc. I used Jeepers & Creepers for cabling, plus an article from the audio phreaks entitled (something like) "The Big Three Audio Upgrade". Our little I6-4.0 XJ fires right off.
Your starter may benefit from a bench overhaul with improved starter contacts (or just replacements). Same for starter ground: grind to bare, coat with NO-Alox or similar.
Obviously, the best battery as well. I'll try an ODYSSEY next.
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