What's the budget you have in mind?

Sometimes the Comp Cams stuff turns up on-line...that's what I'm running on my 360 motor (older 1420-16 part). Hughes has some of their own stuff out there, mid-300s price wise I think.

You could always look for an old set of the iron stuff...the original 273 is what I'm talking about (did they ever come on stock 340s???? no idea...).