Shaft Length

Me again!:welcome:

I've been reading trying to avoid asking this question but I keep seeing different information and confusing the chit out of myself.

I'm hoping to get the rear end put together Friday, but I need to know what length to cut my shafts to. I've seen A-body housing 27 11/16, 28 3/16, won't work with cone style sure grip, yukons suck, buy from DrDiff and more.
Housing = A body 8.75 stock length
3rd member = 489 with cone style sure grip and 323 gears.
Old broken axle shaft with broken splines = 27 11/16in with 5x4in SBP
Current rear drums 10x2in

New axle shafts and brakes
Shafts- called Yukon (ran these in my Rubicons and they always did great, never had any problems) - was advised and purchased kit YAC 8.75 28-32 kit, cut to length axle shafts with 5x4.5 BBP

New Rear Drums and backing plates from 1988 Plymouth Gran Fury with an 8.25

So my question- do my axles work with the cone style sure grip? Do I cut my axles to 28in since that is the minimum length? Do I cut them slightly shorter at 27 11/16? Or do I cut them at 28 3/16? Or am I an idiot who doesn't deserve this car and should call the crusher now and get rid of it all? :BangHead::rofl:

Thanks pics

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