What should an engine sound like?

Bad cam sounds are back firing or not fully firing, rhythmic clunk or bang that is 10+ db louder than the rest of the engine sounds.

Do note that the bigger than stock cam that I'm sure your running will make a louder sound than the stocker which has a lame lobe and lift rate vs. the new cam. The aggressive lift rate on the lifters at low engine speeds can be heard. And as said above, different valve covers, etc.....

You broke the engine in and looked at the oil and oil filter to find nothing of note?
Your probably good. Enjoy the car and take note to what goes on until it performs with trust.

You did match valve springs to the cam right?
Used assembly lube, primes the engine before start up etc....
All the right things .....

Then you should be good. While nothing is perfect the basics should be done for best results and best chances of happiness for the engine, you and your bank account. ;)