my setup ( except carb ) is similar

360 STD bore w / KB 107's
stock 1.88 intake heads ( injection ports (1978))
474 mopar cam
904
dynamic 9.5" converter ( BRINGS IT ALL TOGETHER!)
3.23 gears

I do run a MT 24.5" slick when I am at the track - but the dynamic converter really helps

it weighs 3430

The car gets 16 mpg's
1.74 60' times
12.56 - best ET
108 - best MPH

the only difference is the converter ( call dynamic and discuss your application) and the intake - I run a tunnel ram - with a ported sticker intake it ran:
1.86 - 60'
13.20's @ 103