theres a mr gasket pump that works well from what i have heard. I have the stock gasser intank pumps still working from when the PO installed the diesel swap about two years ago. They overpower the system though and you either need good relief system or a fuel pressure regulator which is easy enough to find. Right where the FSV is would be a great spot to mount it to the frame. Just my exp and opinion.

oh and why leave the pump in place? as a backup or just because you dont know about the chrome block off plates that are 5 bucks from nearly every auto parts store? just get the big block plate, they will know what you mean.