New life for an old 340 (stock stroke)

Just a little street beast with drivability. My buddy has stock j heads, so I was going to use those 1.8 valves. And havent decided on intakr but a lunati cam like a step above stock. So will that kit put a big impact on cr like what else would I have to do? Just want a solid new setup. I didnt think it would put a huge impact on cr? But I could be wrong