The 350 will come on earlier then run out of air and the 500 will give you troubles trying to lean it out enough. That's my experience with them on a somewhat samller engine (188 CID). I don't know that the 62 CID extra would be enough to bring the air demand up enough to work right for the 500 and I have no experience with a 2300 Autolite, wish I could have been more help.
