Stuck valve spring retainers/keeper....hellllp

Well my new cam and valve springs arrived...along with other related parts needed. I have the engine in the car but about all broken down for cam swap but figured I’d change the updated valve springs first. It’s a 5.9 mopar 360/300 performance crate magnum with very low mileage. I’m using the air pressure method with a small spring compressor. The #1 exhaust valve went pretty easy. Was stuck a bit but just a small love tap broke the retainers and keeper free to remove and replace the stem seal, spring, keeper and retainers. No problem...easy beans. The intake valve however is giving me a real problem. The keeper and retainers won’t budge. I’ve got 100psi air pressure in the cylinder and am popping the intake valve open when trying to tap it free. I don’t want to do any damage so I’m coming to the smart guys. Any suggestions would be greatly appreciated. Brian.