340 6-pack ???

I have a 69 barrracuda mod top formula s with a 340 6-pack and a 4 speed.

my question is this. when i purchased the car it had and still has no vacuum pots on the outboard carbs and no progressive linkage. I am wondering if there is a mechanical progressive linkage available that will work or if i need to get the stock parts? any help is greatly appreciated.