spark plug heat range questions.

pjc360 said
the two main things that scare me away from the hei upgrade, number 1 the ability to be able to rev over 4500 to 5000 rpm is gone

Umwhat? That's not correct. Who told you so?

number 2 its a gm ignition and i have a dodge product.

with a Crane ignition not made by Chrysler. Does that turn your car into a Crane? No. Would putting an HEI module in your car turn it into a Chevrolet? No.