Changing cam timing in a 22RE with a factory cam is not going to show much gain.
1 to 2 degrees advance will get you a little more torque from off idle to about 2600, and drop about 1 peak HP.
1 to 2 degrees retard you will lose a 1 lb. of torque to about 2600, and gain 1 lb. more torque and 1 HP at 4800
If your objective is to gain power, you’d gain more power – torque and HP – if you bought a free-flow cat and free-flow muffler. An Adjustable Cam Gear is about $100 delivered. A cat and muffler is less than $100.00.
As a “bolt-in” power gain, if you spent $200 on the right camshaft, you’d most likely gain 3 to 5 lbs of torque and 4 to 8 HP……. Very noticeable.
Gnarls.