It will as said fit ok.
I too agree go for 2.0 to start with, I had a few 2.1(v6 pistons) in sierra's all auto's, the last with a 32/26 got around 135 bhp out of it.
You will NOT get anything approaching 15/20bhp gain from this manifold, expect around 5/8 if your lucky, but it will alow it to rev a lot better.
I had a HT head(injection) on mine was way better for it, used to get 38/42 mpg as well.
Don't bother with a 2.8 transplant as they are not particularly good, a tuned pinto will be way better/faster/easier to tune.
tabetha