OK, what I'm getting is you have a somewhat race car your wanting to detune for street mainly. If this is true, and depending on your budget. For street use I like the TKO 600, but thats my preference. Any of the trannies mention are good products though. As far as motor, if your running a solid over .600 lift I would drop it a little and go with a roller. I have always ran open plane intakes and atleast 750 cfm's with mechanical sec.. 1 thing you didn't mention for the most help is what RPM range you want to run and gear ratio you have.