Lard is the most superior fat for pastry making. I imagine it would be wonderful in a pound cake.
Where did you get your lard? Some is better than others.
The creme de la creme in cooking lard comes from the fat surrounding the kidneys in the pig. It is snow white, pure, delectible and just all around.... amazing. If you can get ahold of that fat from a local butcher and render the lard yourself, you will be working with the best lard available.
Lard from the store is suitable for cooking but I find it to be lacking, probably due to over processing.