Bad bottom end- fix it or 5.4 swap?

You'd need the intake spacers or one of those outrageously expensive 5.4 manifolds. Your exhaust might also need quite a bit of adjustment, and the flywheel may or may not need to be changed. Not really too bad. You could probably find a junkyard 5.4 for cheaper than 1300. I've seen a few of the 3v ones on marketplace for around 700ish

A 5.4 swap is not all that great In a car.
It’s basically a truck motor with a bunch of torque. Just not what a car needs.
Also the 5.4 intake issue , also the ejector issue with the 5.4, I was talked out of doing this swap pretty fast many years ago.
Been very happy with a cammed/ported head 4.6 for many years now.

I would rebuild the 4.6.

if you upgrade later you will be much better off....

more displacement is good, but me personally feel the mod motor needs more bore in a car than stroke.
Dyno sheets and track times seem match this idea.

currently building a modular boss 3.7” bore on a stock stroke.
Gonna find out soon..


the 4.6 powerband wise is just a better choice for a car.