[68post]

If you do have 64cc chamber heads now and 10.5 compression - your next set of heads needs to be aluminum. Then you'll have alot more leeway with the dynamic compression, (you can use an even smaller cam and gain more low-end torque).

Vortec heads are nice if you've planned your build including them, but will cost you when changing over to them.

I'm betting your setup can be made to work with a cam better suited to you. You need to know more about this setup before changes can be made to it tho'.

A fresh rebuild one pc seal shortblock with flattops is a great start, if that's what you have !?