I don't think that I would use more than about a 3.50 gear with that transmission gear set. However... 6th gear is still going to be rather useless.
With the 4.1x ring and pinion, it will yield:
12.341 (Way too short)
8.487
5.863
4.1x
3.444
2.337 (Acceptable)
With the 3.50 ring and pinion it will yield:
10.535 (Acceptable)
7.245
5.005
4.1x
2.94
1.995 (Way too tall)
As you can see the 3.50 ring and pinion would put you in the high side of the preferred first gear final ratio... but 6th is useless... unless you are cruising at 100+ MPH... and even then, any OD beyond 0.75 is unbelievably inefficient anyway.
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