There is a big difference between the .509 and the mildish 226/234 Lunati that was recommended. Like someone noted earlier of the 108 centerline and I believe the .509 has about 246 degrees of duration at .050" lift and a healthy 76 degree overlap.
I would shoot the middle, and if you already have a new timing set with a single bolt I would go with the
Comp cams #CL21-224-4
274/286 duration advertized
230/236 duration @ .050"
.488/.491 valve lift with 1.5 rockers
110 centerline
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If you have a 3 bolt cam gear and if you have sufficient valve clearance I would run the Lunati #60304LK
276/284 duration advertized
234/242 duration @ .050"
.513/.533 valve lift
110 centerline
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(The Lunati will be the bit more aggressive of the two.)
I have the .509 purple shaft in my '70 Runner
I have run a Hughes 223/230 - .512+-/.523+- Very steetable/mild lope
And also the Comp XE that I listed, nice lope, well liked all around and with power brakes.
For most all around use I like the 110 centerline with a span of 230-242 duration @ .050"