So I pegged the 24’s on my Coupe with a 306 making 280ish rwhp so around 340 fwhp. Calculators all showed around 310 fwhp at 80% duty so this made sense. Swapped to 42’s and it jumped to 300+ rwhp the next weekend on the dyno. The 42’s were moved over to the current 331 making 460+ fwhp and my tuner said they are about at their limit. He also let me know that I’m running out of fuel pump as he had to bump the FP up to keep up with the motor. Ran a couple injector calcs at 80% duty with the 42’s and 550 fwhp is about their limit. Car is getting a bigger fuel pump this winter.
You said it’s not a race car but a lean motor is a lean motor so be weary of the 24’s on that motor. I would say you need 36’s and a fuel pump to keep up to be safe but it’s your car.