Engines are air pumps. Doing a port and polish 1st to make sure the air travels through your engines cylinder head ports properly will make the biggest difference even if you don't do any other modifications.

If you change the camshaft, without doing a port and polish you are limiting the difference the new camshaft can make. Changing to a new camshaft with a port and polish will let the camshaft work its best.

You will realize some difference with modifications but not near the increase you will gain if combined with a port and polish.

Many engine builders that install our ported and polished heads first, don't do any other mods. They are happy with the significant increase in horsepower and torque.

Sometimes they will change the camshaft to adjust the power curve.

I will offer advice to help you achieve the performance you desire.