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I would just drop a 5.0 in it and call it good. Welcome by the way.
That's going to be quite the stroker kit. The 4.6 is only 286 CID. Please post a build, I want to see this.
The 5.4 is heavier, taller, wider and requires the use of much smaller bore diameter and a longer 4.350 stroke. I do a lotta mustang work and the 5.4 in a mustang results in a very nose heavy car. The 5.3 has only a couple intake manifold options and it also requires custom headers and has minimal clearance at the strut towers. The 4.6 based engines make for a much more cost effective and lighter powerplant.Why not just use a 5.4 block with the 4V heads?
SVT