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No ideas other than make sure you're pushing the center of puller against the crankshaft, and not the center of pulley. I'm only familiar with the 3.2 and 3.5 where the pulley has a center that positively stops at crank snout, unlike the v-8s that most folks are used to messing with. In the case of the 3.2, 3.5, you have to place some kind of dummy spacer smaller than the threads of the crank bolt you removed. Hard to explain. 
I about guarantee this is your problem.... Find a bolt the same thread as the crank bolt only longer, thread it in the hole & press against that.... Or just try using the original bolt only threaded in a few threads to get started....
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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