Why bother?
If you're looking to piss away $1500+, I'll give you my address and you can just send me a money order. I also have paypal. :lol:
On a stock 305, there is not going to be any real difference in power. I think the only thing that will be different is that you won't have to pump the gas to set the choke when starting it.
I vote leave it as is, or go wild and make it worth putting fuel injection on...