I don't think it'll be that bad at all. does have the overdrive and even though compression is 11-1 also has the long duration cam and that will help somewhat with regards to detonation with pump gas. can also back off timing to see if that would help if it does ping.
when do you plan on taking this trip?? if not real soon then maybe take a short highway ride to see how it goes before heading on a 260 mile trip.
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