front drums w/o hubs?

1st. Remove the drum hub assemblies off the car and lay them down with the studs sticking up
2nd. Soak the mating surfaces including the studs holes with PB Blaster or similar and let them soak
3rd. Take a good 2x4, place it over the hub end and hit it with a hammer. If it doesn't come loose the first time soak it some more and repeat the 2x4 and hammer process.

Okla, the studs are swedged to the hub. No amount of hammering will release them without destroying something.

kittypc, A machine shop is the best choice to change over the new drums for you IMO.