Stiffer front shocks

I recently did the full suspension on my 71 Duster complete with "factory comparable" front shocks.

I dont even have the hood on the car yet but it seems after the car has sat in the garage for a couple months, suddenly the front end is sitting so low i cant get a jack under it.

It wasn't like that until the other day after my first test drive.

Nothing appears to be broken, and after i did finally manage to jack it up it was sitting higher again after i lowered it down, but clearly its just going to keep sagging because these shocks dont have enough ***.

What shocks would y'all recommend?