Not sure about the 3.5 engines but 7.5's were a "bugger" to get the large bearing off of the crankshaft.
Had to use a Bearing separator and press to get them off the first time.
Would dress the crank to a snug slip fit for the new bearings.
To remove the bearings.
There are MANY ways and as many opinions.
What has served me well for years is to heat the bearing surfaces on the outside of the case with propane torch, once hot, you can "slam" the bearings out onto a wood block.
If bearing is stuck on crank, tap crank out with brass mallet. Then use puller as mentioned above.