I would not recommend the 750 holley on a heavy c body with highway gears.It will run just fine but gives up low end with the larger throttle bore.Did that years ago on a stock 440 in 68 Chrysler 300 with 2.76 gears and it became a turd off the line.Just my opinion.
I might opt for an AVS carb or the eddie 800 afb if I were going squarebore.Check for hood clearance with the rpm intake.It is the best intake but tall.