No, the Boos 429 will need mods for the engine to fit in the 1998 Mustang.
They may fit with spacers, but they will not be a direct swap. You also have to consider the center bore of the wheel - they may be different.
1969
There is no horn relay on a 1970 mustang
The wheelbase for a 1970 Ford Mustang is ( 108.0 inches )
It doesn't drop right in. It will take some fitting but can get it to go.
429 cubic inches (7.0 liters)
yes
Will a 1998 3.8 mustang engine fit in a 2000 Mustang 3.8 engine?
Mustang wheels will fit on a 2000 Crown Vic depending on the year of the Mustang.
The mufflers of a 2012 V8 Mustang cannot fit a V6 Mustang of the same year.
the 427 was the largest engine the mustang was made to fit