1.) you shouldn't need anything to hold the lifters up.

2.) Intake does not need to be removed because you still have no access to the lifters.

3.) Valley cover does not give you access to the lifters. see 2.

4.) pen magnets must be small enough to pass through the pushrod holes.

5.) when you remove the timing cover there are two holes that you can pass a rod down through the length of the engine to hold the lifters up.