Do I need one?

RustyRatRod said

Probably not. It's all in the tune, really. If you tune it correctly without manifold heat, it should run fine.

Click to expand...

He's right.
One thing I will add is that even if it's 100 degrees out, a cold engine needs to be warmed up for at least a few minutes before driving if it doesn't have a choke or heat under the carb.......