valve spring question

If your spring seats are OEM, you can't use double springs, without cutting new spring seats.
Have no fear, there's plenty of spring choices out there in a single that will probably work.
BUT, all this depends on what the cam needs and whether it will fit under the stock 1.700 installed height.
Umbrella seals, aren't really seals, they just 'umbrella' the oil from the stem. But not very well.
Positive seals are out there in just about any flavor you need. Just measure the top of the guide and buy accordingly.
Also too, the OEM guide height will limit how much lift you're going to be able to fit. Usually less than .520 even being careful with seal size.
I need more info Mike... I mean, moparfanatic56