4cyl to 351W

do some more searching but these are the basics,

since you didn't post what year your car is 92-93's have a different wiring harness than the 87-89, 90 (air bag harness) & 91 (different harness and air bag) 92-93 ( different harness again and air bag) in relation to relay locations, headlights, o2's, tranny type, etc so try and keep the harness to the year.

The 4cyl uses different brakes than the V8, the front calipers, spindle,hoses,brackets, and master I would upgrade even more so going to a 351.

The 4cyl has the weak 7.5 rearend add a 8.8 swap to list if you are even thinking about feeding the torque of a 351 to the 7.5.

fuel lines run up the drives side on the 4cyl and on the pass. on the V8

351 swap headers are needed for starters on the 351 swap but there is tons of info on the 5.8 swap.

4cyl radiator to small to cool a 351, also need hoses and fan set up.

4cyl springs are on the soft side for holding the weight of a V8 I would upgrade ..your call.

4cyl steering rack works but the V8 rack is much better.

I would get a good donor car of possible to grab parts off of. have fun.

Yes it is a must. The v8 fuel rails go down to the pass side wheel well where the fuel lines come up for a v8 car, while the original 4 cylinder fuel lines are on the driver side like previously stated and would not work.