I'm not a paint expert but I am painting my Cuda the same color as you.
I used the gray high build primer, sanded to 400 grit.
Then Base coat white, base coat yellow, then clear.
A 2 gallon kit of PPG Omni white was $134 gal, with the reducer another $30, but that makes 2 gal total.
I figured that was cheaper than buying a white primer.
Dan