if it were me, if the pistons are .014" above deck or lower, I'd go magnum heads with hughes #1110 springs and choose the head gasket accordingly.

cam for your gear, I'd go comp XE262 or voodoo 60402.

headers, and a dual plane (LD340, air gap, or perf RPM)

I'd stick with the 600. you probably won't loose much below 5000 RPM...

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)