1990 360 engine, trying to retrofit it to use a mechanical fuel pump.

Hey there. A couple months back, I bought this:

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It is a 1990 360 from a van. It has a car oil pan and a few goodies already in place including the valve covers, Air Gap intake and this:

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As you can see, water went through it, maybe due to a bad head gasket or cracked heads.
My question here is regarding the fuel pump. These EFI engines had the hole blocked off where the mechanical pump usually fits but I've heard that an aftermarket pump eccentric allows you to retain a traditional mechanical pump.
Who makes these things and who sells them?
Thanks....