2001 454 MAG MPI, lower manifold corroded. Options I've come up with so far:
replace with carb (requires a bunch of ignition parts swaps?)
replace with OEM part(s) from OSO/Ebay
replace with 500EFI setup (anybody done this swap? Parts interchange?)
replace with Holley EFI setup
Perhaps weld up the lower manifold if it's not too far gone. But being a salt water engine I put it far down the list.
A cam and maybe headwork are on tap for upgrades but nothing radical. Aftermarket exhaust that is Silent Choice compatible might be on the list also. Primary goal is to be running again as quick as possible.