To further explain why 19's would be better that 24's or 30's is that you would not be maxing them out (overworking them) in your application. As said before, unless you have a dedicated race car that is constantly getting rev'd north of 5,500 rpm (with your kind of motor) it's not a problem. Considering the average 302 (in a mustang) with HCI makes max power around 5,000 rpm but gets rev'd to 6,000-6,500+ is one of the reasons for the %80 injector rules as that the demand is really more than just what the peak HP the motor is putting out at peak. Absolutely, richer (for safety) is better than lean, but you won't be maxing out 19's in your app as RangerSVT reminded, because your rpm will be limited to 5,000. From the other extreme of washout (which honestly I have no experience of) is injectors being stuck open due to over working. Like running your motor at redline all the time vs 4,500. But that will not happen in your case because you won't be stressing the 19's that much.
I come from a mustang background so I often confuse the 302 engine needs between low/midrange power for truck/crawling and 6,500+ rpm track/racer needs. My Bad.