Looking at a mid 2000 Donzi ZX and trying to identify if the motors are indeed 350 mags. The engine covers have been replaced so they don't say 350 mag on them. How can I tell by looking at the motors if they are the 300hp Mags? Am I correct in thinking that the 300hp mag engine has the four center bolts on the valve covers and 8 bolts attaching the EFI to the intake? Anything else i need to look at?

Thanks

Have a Merc dealer run the engine serial numbers or post the serial numbers on here and someone will probably help