engine swap
Only help I can give is that it's been a common topic...do an advanced in this forum search for "5.0 swap" or "351 swap" and you'll likely find a ton of info. Here's a couple to start with:
https://www.ford-trucks.com/forums/9...light=351+swap
https://www.ford-trucks.com/forums/9...light=351+swap
https://www.ford-trucks.com/forums/9...light=351+swap
https://www.ford-trucks.com/forums/9...light=351+swap



