The compression on a stock 350 isn’t ridiculous so it can handle 10*-12* base. I’d do as much as possible without it pinging. A 305 can’t do that much in my experience, but that’s a different story altogether.
If the overall setup works for you, no point in doing a shakeup. If you don’t have mechanical pump provisions on the motor or the cam eccentric is worn out, the electric is understandable, but if there’s a way, I’d leave the electric pump at the door. The ones that sit in the tank are a solid, proven design while the ones that mount externally are junk, but either way, having the mechanical pump right there in front of you is a no-brainer. Edelbrock is a good company, but I’m not one to seek their carbs out. I grant that they work, but I like Holley for the aftermarket option and prefer to stick to OEM 99.9% of the time. The Quadrajet might be the most advanced carb design challenged only by the Thermoquad. Why make fire by rubbing two sticks together when you can just use a lighter?
This is generally a loaded topic, and while I have my reasons and could rattle them off even longer, everyone has an opinion so take it for what it is.