How much leaner with headers?

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vntned

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So long story short. I put a FAST AFR datalogger on my '64 dart.

(Mild 360 4spd. Stock 1.88/1.60 Jheads, LD340 Street Demon 750, Comp Cams 268AH10, 9.4:1 actual cr, 340HP exhaust manifolds, 2.25 head pipes, 2.5" after the muffler)

Anyways, at idle I'm 13.5-14.5:1, cruise 11.5:1 and at wot it's as rich as 9.5:1.

So my question is, without changing anything else, how much leaner would I get by switching to some TTi long tubes and a full 2.5" exhaust?
 
The long tube headers will help ,with torque. Seems overcarbed, to me . . A 650 double pumper , or a 3310 vacuum secondary....would help immensely. Has the distributor "been curved "?.. 14 -16 initial timing ,34-36 @ 3000 crank shaft RPM will get you close ..Automatic ,or stick shift.?
 
And there aren't any driveability issues. It idles great and runs smooth through the entire rpm range.
 
Better exhaust system is going to improve the air/fuel flow thru the engine. It is not going to change the AFR 2 full points. You need to get a tune kit and get it right. Use the data logger as a tool. Get the cruise fixed first, then jet the secondary.
 
^^^^^^^^^^^^^ keep the carb and do some tuning, that's why you got the data logger, right ! Definitely do the headers.
 
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