340 cam change

Funny you mention that story/experience, I am getting ready to do something similar since i wiped a lobe last week. I hope it works as positive as yours did!
Watch for pistons hitting the head, or valves crashing pistons; measure measure measure. I got lucky that all the parts played nice together.
And above all, calculate your predicted Cylinder Pressure/ Dynamic C/R, before you torque the heads on ......... especially if running iron heads. With a stroker, you can very quickly get into pressure problems when downsizing.
All the best to you.