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

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

View attachment 1716331305

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:

View attachment 1716331306

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....
The '89-'91 360 tk roller should be the same cam as the '85-'89 318 pass. car roller, which had a mechanical pump...take the block-off plate off & look inside, there may already be an eccentric in there, or a spacer which would be swapped out w/a factory eccentric.