65 cuda

I am restoring a 65 cuda with a carter 1 bl card. I took it apart and it is full of gunk. Even though I am cleaning it would I be better to buy a rebuilt one. If I do I can only find a holly. Some say that would be better than the carter. Others say stay with the carter. This is my first total restoration and I need some advice from some of you guys.
Thanks
Tadams