Same experience with my 493. Running 3.55s and 4.10s, margnial difference between the two, also no difference shifting between 5500 and 6500, 530 cam 260/266 @ 0.050.

So I run the 3.55s and shift early...it's a blast on the street.

Faster, Faster until the thrill of speed overcomes the fear of death...

71 Swinger - slowly collecting dust/parts
66 Belv. II - just a streetcar
88 Mustang - turbo LS beater