Convertor/Gear Ratio Advice

I am looking for advice on a convertor stall and gear ratio for my Dana 60. The engine will be a 408" topped with a 6v71 blower. expecting ~600hp. The transmission is a 727 and then a dana 60 out back.

Driving condition will be 70% street and 30% cruising (some longer trips hopefully in the future). I'm thinking of a 3.54 or 3.73 due to the high low end torque this engine will be pushing. Id like 4.10's but suspect cruising at 60-70 mph would be +4000 rpm. 275/70/15 tires.

Thanks