Okay well here is what I did, it is simple.
Download PBP Unpacker
Buy any PSX game off of psn and install it on your ps3. (Lets say Spyro)
Connect FTP and get the EBOOT.PBP File from the psx games directory.
Download an EBOOT.PBP PSX EBOOT PSP Game from pspiso.com of the game you want. (Lets Say Resident Evil)
Open the EBOOT.PBP of Resident Evil and extract all of the files to a folder and name it Resident Evil.
Now open the PARAM.SFO that is in the EBOOT of SPYRO and EDIT it if you like and extract it, overwriting the PARAM.SFO in the Resident Evil Directory.
Now choose to make a NEW PBP using all the files in your Resident Evil directory. You should be using the PARAM.SFO from Spyro to build it.
Now when you got your NEW EBOOT.PBP upload it to your PS3 SPYRO directory, overwriting the original (MAKE SURE TO BACK THEM UP!!!!)
Turn PS3 off then on again, launch SPYRO and it should work as Resident Evil.
If by chance this does NOT work, you may need to Edit TWO PARAM.SFO
1. In the Root Directory of your psone game on the ps3.
2. The PARAM.SFO that is injected into your EBOOT.PBP
The edit you want to do is change the DISK_ID to that of your Resident Evil (Which is SLUS00747)
You may also need to sign the file! Find that program.
Key here is you need to OWN a PSOne game to replace it!
Now I may have missed some steps here as I was trying a TON of different things, if so I am sorry.
I used this method to get Resident Evil DC working by using the Resident Evil Files to replace the Castelvania files in the EBOOT.PDP.
If anyone finds more info please post it.