are there any good websites to get parts to build up on a 5.4L engine block and what will i need to do for it to fit in a 98 mustang engine bay

 

https://mustangboards.com/modular-4-...sted-5-4l.html

 

there are lots of places. It really depends on what you're building for us to tell you a good place to go for part-x.

pop into the 5.4 swap thread linked above and post up what you're doing and what you need and we'll point you to the best sources. for the most part it's a straight bolt in.