Whether the transmission will fit you application is something that comes from experience. The members of this forum could be your best source of this information.
To assist with determining what gear combination should be you next concern. The wrong gear combination could hurt the performance of your car rather then help it.
Try the following website <a href="http://www.pchotrod.com" target="_blank">www.pchotrod.com</a> and email me the information pertaing to your car and I'll assist you with gear selection.