you can buy te painless wire hardness. its not cheap but easy to install. i wish i had the $ to do use them when i did my 4c to 5.o swap myself. i am still trying to figure out why my blinkers and wippers dont work lol. if you can help with that please let me know.
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fromer owner of 1968 mustang, own 1990 lx 5.0,1989 lx, & a 1995 v6 . the one im swapping is the 1989 it has trick flow intake, mac shorty pipes,off road h-pipe, flowmasters, pro 5.0 shifter, t-5(5yrs. old), msd ing 6a & matser blaster 3 coil, mds spark plug wires 8.5, no smog, elec. fan, rebuit engine, 3.73 gears, underdrive pulleys.