A car needs to hook and have some good power before it will need frame connectors. If you have a mild 360 you won’t have too much power, and if radial T/A tires you won’t have much traction on the street.
Well, I agree if all you are doing is spinning your tires. But if you're hooking up good and your doors won't close and your windshield cracks then you'll know you need em. Then it's too late. I had a V-8 Vega that I learned this from.