I love EFI as much as the next guy, but if your issue is hard starting/fuel evaporating, why not an electric fuel pump? I run a 750 mighty demon on my 440 and it has gone through stretches of 8 months + where it doesn't get started. With the electric pump it turns over about 5 times and fires right up.

As far as running poorly once it does start, I'll let one of the carb experts answer that one...I dont have that problem.