Timing w/ LT4 KM & Digital 6 Box?

[1FastRedZ]

I went and bought a Dig 6 box. I put the stock KM back in (thought I was going to get a 6AL) Should I put the LT4 back in and just retard the timing a couple of degrees? Or just put the LT4 back and keep normal timing? I'm only going to use a 100 shot.

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95 Z28 6 speed Functional SS hood Headers Y-pipe FlowMaster LT4KM 1LE intake below 4:10's SLP shifter 17" Firehawks SLP Clutch & PP
HPP 160 92 Dodge Viper Red