Regarding the timing topic... my old 455 with a relatively small cam and iron heads really wanted the advanced timing at cruise or would overheat quickly. At the time I think it was running 36 deg mechanical advance and the vaccum canister would add another 10-12 degrees at cruise.
Meanwhile my current build with twice the HP and KRE heads with 28 deg of mech advance seems to care less if the vacuum advance is connected or not! I assume the current combination of parts is simply working better together
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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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