same as what we stated above. The 302 dizzy will not work on the 5.8. You must find a 5.8 dizzy from an 88-91 Bronco - F350. You will still need to get a steel gear installed on that dizzy to be compatible.

 

If that is right you need a different flywheel, these two engines have a different primary balance 50oz for the 302 and 28oz for the 351. But I wouldn't assume the motor that came in the truck is original you should verify with the block casting numbers.