454 MPI upgrades...

[SickSation]

I know most of you will recommend doing an engine swap, but im lookin for some additional bolt on power. I currently have a 454 gen VI MPI (non MAG). Im basicly wanting to put aluminum rect. port heads, better cam, 454 mag or 502 intake, inj., ecu, and headers. My question is, what kind of Hp increases can i expect to see? Am i approaching this at the right angle so to speak? Id really like to stay with EFI. Im getting headers soon. Im sure that will help quite a bit. Im not getting into the bottom end, so im not lookin for too much power ( forged crank). Anyone have recomendations for what heads, cam , ect I should go with? I have a friend with a Baja272 that might be a bit faster than my sunny 25ft ( havent ran the boats together yet), but I cant let a Baja beat me. No offense to the Baja guys, There just very trendy here in Indiana. Thanks in advance.