440/500 Cranking issues

I'll have to get my torgue wrench on the crank.I'll have to do more testing as you suggest . Yes 1 ought not fine strand I got free from work. I just learned that my shut off switch should be hooked through the ground ? I have Positive wired thru it . My battery is old and sitting so it's now in question but at the start when engine was fresh I put a larger battery 850 CCA (New in it)
So I guess I should be addressing those issues 1st. Maybe take some before and after readings. Not now this week in the 90's and I'm in the middle of fixing the rearend of my truck in the driveway. I definitly need to get my son down there as so far I'm doing it alone.