Morning John
Thanks for pictures - looks great. To answer your question I've got 2.8 in mine - done by previous owner. I drove it back to back with another 410 which is ( I believe) on same ratios as yours last summer. My subjective memory is sort of what you'd expect - on rapid starts the 3.07 picks up quicker but once you're rolling the difference in performance is not really noticeable.
Once up to cruising speed the 2.8 makes a noticeable difference but in my case previous Owner also installed later gearbox with overdrive and lockup which is excellent particularly on long runs.
If you need any stats am out and about in car so happy to report back.
Cheers
Andrew
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