I have the aem 320 e85 pump. It was a perfect drop in, although i do recommend a re wire. Before that i had the non e85 aem pump and ran it for over 2 years on e85 before i died. Im going close to the 2 year mark on the aem e85 trouble free. I reused the stock filter sock.

 

I'd either get a walbro 255 or 450, I have had both and have had zero issues. 450 is pretty quiet too for how well it flows