The guages are computer controlled so if you want to keep them you will need to retain the stock computer for those, mostly the speedo.
The 302 will destroy the stock trans and tcase which is good as they are not even close to be able to bolt to each other.
v8 and SAS are all most common mods there are many build threads on this board,m among many other sites. You need to do some leg work and see what has been done and with what.
If you got a cut off wheel, grinder, and a welder you can make anything work.
99 x-cab 4x4 4.0l auto
mods, cranked t-bars, silencer delete, k&n drop in, Rebuilt trans ,Trans Go stage 3 shift kit, 3200stall Fuddle Racing Torque Converter,
VANIR 63mm TB, Roush split rear exit exhuast, E-Fan, JBA Headers
Auto up/down both windows, OHC, EATC (soon to be modded)
03 Crown Victoria Police Interceptor