Driving from Zihua to Manzanillo

We are contemplating driving from Zihua up to see friends in Manzanillo. Either this summer or in the fall. I see that there are several who drive to and from the north. Could we safely drive the coast road? Or would it be better to head up north from Lazaro Cardenas and up through Guadalajara and then back down to the coast. We have driven the Guadalajara to Manzanillo stretch in years past. If you have an idea of the distances or, more importantly road conditions and safety, and maybe offering the best choice. Very much appreciated. We love this board. You all help us navigate this beautiful area so well. Hope we can be of help to others some time, too!