Issue: In the cold weather (50 and below) the car was missing.
I figured it was running lean (due to glowing headers at idle) so a friend and I retuned it.
Idle in Neutral: 19 degrees
Idle RPM: 1080
This high idle was needed because of the old 904 trans and stock converter. Much less and it wouldn't stay alive in gear. Now I have my 518 AOD and the converter is much looser. Keep in mind I have not jacked with the cars tune in years and never had any issues because I never drove it in the cold before.
After our first tune, we had it set like this:
Warm idle: 940 rpms (800 in gear)
Timing @ idle: 22 degrees
Gauge shows good vacum at idle in neutral and in gear.
I felt the timing was way too high, but my friend is a dirt tracker and he thought it was fine as long as it started when hot. It runs OK, but still missed when engine was cold.
So I did some rework on the tuning:
Neutral Idle: 780rpms
Idle in Gear: 690rpms
Timing @ Idle: 17 degrees
Vacum: 15 inches @ idle
<- This is the best I can get out of it, but reading up on the web says that's normal with bigger cams and more overlap.
I adjusted the carb per the manual...I think it's reasonably close.
Fully warmed up I am reading 240-260 degrees at all of the header primary tubes (ceramic coated).
Now, with it set like this, and still not warmed up, it missed, as you can see in the first video below. After this I drove it for 15 minutes at all different speeds with no further problems, except that it is heat soaking. After sitting for 20 minutes with the engine OFF, it has the damnedest time starting.
This is my engine setup:
360 9:1 CR
625 Carter AFB - Electric Choke (new type)
Edelbrock Airgap intake
FBO Stage II Ignition (custom timing for my future 3.55 gears)
Cam: Herbert E3N 455/475
Video of it missing: