That should be a strong running engine. Describe how you calculated 32,34,36 total timing vs 24 degrees at 3k rpm - this is way too low. Initial timing + mechanical advance should be around 34-36 degrees and if using vacuum advance another ~10 degrees at light load. I would certainly verify the balancer hasn’t slipped. Was cam degrees-in? What is the history of the engine?
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Will Rivera
'69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
'69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress
‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here:
https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb
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