Could I run pcv of the intake manifold instead of the carb ?

Most engines benefit because it helps ring seal even on plain pistons. But that doesn't mean it's great technology for your street car. They tend to wear out quickly when you put them in an environment like a street car.

You can run the PCV off the manifold - but it has to be from the plenum area, and if it's possible, you're better off putting it into a spacer or something that pushes it as far from any individual port as you can for the reasons noted.