Well Gene, I'm sorry to hear about that problem.
I hope that it's just the head.
There are some big choices to make if you have to replace the motor.
With todays gas prices you probably don't want to put in a performance cam. But a better quality cam is a good idea.
Napa is probably as good of a place as any for a stock crate motor. They have them available in Canada, so they should in the U.S.
If you want performance look into Summit Racing
http://store.summitracing.com/defaul...2.asp&N=400240
If you want the best prices look into E-bay.
If you want a v8 in the near future it's the time to install it.
A SBC v8 will bolt right to the transmission.
Good Luck