Watch the AFR as you go down the highway (maybe have another person drive, as you tune).
Watch the coolant temp, TPS, load, duty cycle, etc. Then adjust the cruise AFR up or down maybe .2 - see what changes. If you start feeling a lean-surge, then richen it up.
I have the XFI Sportsman system on my 455, which uses the same throttle body you have. I've been able to put my highway cruise AFRs into the 15's, and the motor runs smoothly.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
My webpage http://lnlpd.com/home
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