11.02 @123

or swapping to 4.10's and going 6100 in 3rd?

6100......plus whatever the converter slips.

That’s probably the route I’d go.

Looks like the OD ratio is about .78??

My old 448 with heavy TRW’s and LY Rods would run about 6600-6800 out the back...... depending on the air.