Something to concider if you'll be running pump gas, the 461 heads dont have hardened exhaust seats so that could be a problem, unless somebody has put them in there.
Vortec heads do have hardened seats but like bowhay mentioned with a slighty higher performance application like you intending they'll require a good bit of work to make work.
I also agree with the other post, pass up on both and get the Dart iron ealges. The price is about the same and it's a excellent head.
Stick a healthier cam in it and you'll be much happier.
JMO>Cp