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stall speed relates mostly to getting the car off the line in a stronger potion of the power band. by running a lower stall speed you won't do any damage to anything but you will notice a pretty big difference in performance. with the number of other pricey parts and work you need done you may be betyter served to wait and just keep an eye out for a good deal on a more appropriate stall speed. the less expensive models will always be there, so you have time to wait and plan to get the bigger one. if it doesn't come along, no loss to you.
you could run mor egear to try to offset the lack of stall speed, but then you will run into issues down track. you want your gear ratio chosen based on your trap speed. pick a gear taht allows the engine to rev through the entire power band a little before you go through the traps.
if you throw in a numerically higher gear to get the car out of the hole better, you may run past the best rpm range of the engine before the end of the track. if you only go a small step higher, you may be able to get away with it out of the hole, but it will effect down track performance.
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