While pricing a new cam - the DC engine book says I need these springs.

MOPAROFFICIAL said

These work, I've used them with that .528 solid, but the real drop in spring is the mp#847 spring.

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MOPAROFFICIAL- what did you mean- "but the real drop in spring is the mp#847? What is that? I assume P5249847 spring I was also looking at the P3412068- a bit more spring pressure but a bit more $ too.
My dealer says he can get them for about $8.00 per spring next day. seems a bit inexpensive to my memory.