Most headers can be made to work with the P heads. You dont HAVE to get special headers, but you should to prevent future frustration.
I'm using BBK shorties on mine, and the only plug that is close is the #7, so I just used a 90degree boot on that wire. The passenger side has plenty of room on all 4 plugs.
like Dark_5.0 said, your springs are fine up to .520 lift, so as long as you dont go crazy with a cam choice, then you'll be ok there.
BTW RR's are a must IMO.
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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