if she just wants a little more pep from the 3.1 i would look into some roller rockers. comp cams makes increased ratio rockers for all the 60* motors. with a few other minor adjustments it would certainly give enough power to have some fun smokin the tires and it is a heck of a lot easier/cheaper than an engine swap.
if thats not enough power, spray it. those motors are known for staying together forever. lol
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