727 build advise

So my next project for my 73 Valiant is to replace my whiplash 318 904 setup with a 9:1 or 10:1 360 build with a 727. The car will be a street car/daily (and by daily I mean I would drive it often as I don't care what gas costs as its all about the fun)

Im looking to see what components I should change to make it more durable, and withstand my severe lead foot. I would like to put a bigger pan, front trans cooler to help prolong fluid.

My current core, is from a 73-74 truck or van as it had the stubby tail housing for the 2 piece drive shaft. I have the correct housing and shaft to convert it to a passenger car trans. I took it apart today and I has 3 gear front and rear planets. Should I change these to 4 gear planets? I plan to use a B&M shift kit, along with a quality master kit either B&M or transGo. Any other suggestions would help out.
Thanks
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Be sure to put some money into a GOOD torque converter that is just right for the combo you have. Rear gearing, tires, and the camshaft you choose will figure into that build.