Neither a 302 or 351 intake, efi or otherwise, will fit a
351C engine. However,
www.pricemotorsport.com makes
adapters to fit either type onto the 351C. Then your efi
harness would work, but they're not cheap.
You'd want to check the firing order to make sure it's
the same as on a 5.0 HO motor. If not, your efi won't
idle very smooth, but would smoothen out once up off
idle a little. I'm not sure if the motor mounts are the
same as a W motor or not, check the below link for info.
I think they are.
Headers and oil pan will likely be a real problem, but look at
this site for swap headers and oil pans, etc, and maybe mounts
if needed.
http://www.kaufmannproducts.com/
Also the front accessories won't bolt up, the whole water
pump setup is different for starters. You'd have to buy
a serpentine belt conversion kit, and they are not cheap,
or stay with V belt drive and find all the brackets, pulleys,
etc from a C engine. Then I think the radiator hookups would
be on the wrong side.
That C would make a nice motor, and it isn't as tall as a 351W, but it wouldn't be a cheap swap.
Here's info on 351W swaps
www.lincolnsonline.com/article144.html
[email protected] if I can be of any help
Everything considered, you're better off with a 331 or 347.