When is Sure-Grip actually necessary?

70 Dart, mildly warmed up 318, MAYBE 300 hp is the plan. Automatic, 2000 stall.
3.91 rear ratio. Do I NEED Sure-Grip? Would it FRY one tire, or just spin a bit and then go?

I'm thinking about putting an open carrier in first, and then just SEEING how it works out. I do know of an available 3.91 Sure-Grip, AND a 3.91 open... there's about a $350 price difference, hence my train of thought.

Thanks in advance for your input.

JD