Yes. I have had that issue on my iron head motor in the past.
We are running 34 deg mechanical, and have tried 44 total advance with a stop welded on the canister. I also removed the stop and let it advance fully to 48-50, which seemed a little better than 44 cruise advance.
As I think about it, full advance was not coming in until close to 4k rpm. I could put a lighter spring in dist to bring full advance in a little earlier. 4spd car so should be able to be a little more agressive with the advance.
On a side note, we did run this engine on the dyno after the build, and check points like exhaust Temps, A/F, etc were in good shape. Newer aluminum 15" radiator, fan clutch, decent fitting shroud, and aftermarket steel 7 blade fan.
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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