Named Instance & Clustering.

Hi all,
I have some questions regarding Clustering.
(1) Can we create Default Instance & Named Instance in the clustering environment (i.e.) two instances in clustering on same hardware.
The idea here is , to put some highly transactional databases on default instance ( and giving 5 CPU's to Default instance ) and on the Named Instance ( giving 3 CPU's for Named Instance) in CLUSTERING ENVIRONMENT.
(2) Can anyone guide me , how can we restrict the instances to take 5 Cpu's & 3 Cpu's repectively Iin CLUSTERING ENVIRONMENT.
Thanks.