You can remove the rotators, this is commonly done. Remember to check the valve spring installed height. This is important because some heads had different depth spring pockets and others used shorter exhaust springs to compensate for the rotators. In the end, you want the springs all installed to their specified installed height so the spring pressures are correct for the cam you're using.
As for the seals, if you are NOT using positive type oil seals on the valve stems, reuse the tin shields and O-ring like the factory used for many years.
If you remove the tin shields and only use the O-rings the valve guides will pass more oil than is necessary. That can hurt performance by contaminating the incoming air/fuel mixture w/oil and can allow carbon to build up on the back sides of the valves, hurting flow. And the engine may
If you remove the tin shields AND do not use the O-rings, the engine WILL smoke.
• Valve spring installed height
• Valve train points to check
• Valve train geometry