/6 spool mount K member or find V8 spool K?

Getting the suspension ready for a Duster project. I have access to a /6 K member spool type but thinking it might be better to locate a V8 spool K member? Are there any major strength differences or benefit to using a V8 spool K member over a /6 spool K member? I will be using a 360 block in the car.