Hi, first post here. I have a Blueprint 396 Stroker I just bought off a buddy. It's never been ran except for the dyno at Blueprint. It came with a gear drive on it, which I want to get rid of. My cam is: Roller .510 Intake .520 Exhaust 230 Intake / 236 Exhaust duration @ .050, 110 ° lobe separation angle My question is (sorry if it's stupid), is there anything extra I have to do, other than pulling the gear off and putting on the new double roller? The reason I ask is, behind the gear on the cam you can see the block has been ground a little (see pic). Is that because the cam is a hydraulic roller? Also, when I go to a double roller timing chain; do you have any suggestions of type or brand? Thank you for any input. I'm a little new to the engine building community, thus, I may be asking rhetorical questions here.