No I never stop. Thats half the fun, ALWAYS find something to work on the car!
On my TKO trans, the crossmember was already moved back as far as it can go. I need another inch (or 2"), and it wont go anymore. So I will have to add some metal to the "plate" of it, and extend some slots even further back.
My goal is to get closer than the 57/43 front/rear ratio I have right now. The BIG help will be the aluminum heads I hope to install this winter.