The 1958 KR cams (25499-58R) are listed as having the intake lobes stamped "A" and the exhaust lobe is stamped "L".
The "A" Intake timing is listed as open 76/72 close with .420" lift and the "L" Exhaust timing is open 68/38 close with .375" lift.
The "L" exhaust from 1969 has timing of open 65/40 close with a .395" lift.
Anyone have any experience with the 58R "L" exhaust compared to the 69R "L" exhaust?