DIESEL dart :)

ok so i know some people are going to be mad cause it is sacralidge and some are goint to be mad cause im broke so this isnt going to be one of those great overnight builds but it is slowly happening i and saving to buy the 4BT or a 4BD1T and a TH400 (i know its chevy but it bolts up to the motor and was built to handle it)

currently i have the intercooler and the idea and that is about it

things that are going to need to be done

*build custom front suspension and k frame(not looking forward to this part)
*widen trans tunnel for th400
*find either a 8 3/4 or ford 9inch that is the correct width for this car
*mini tub the rear for 8-10 inch tires
* find a radiator shop to build 4 core radiator
*raise the hood "buldge" 2 inches for clearence


things i need some help deciding
front suspension stock torsion set up or coil sprung???
how to build center link for frame(X beam, H with drive shaft loop or just a straight bar set up)???
rear suspension???
gear ration (i am thinking a 3.06 remember this motor goes to 3500rpm and i plan many highway miles)
and what else may need to be done for the car to reliably deal with 500-600ftlbs of torque

if anyone one has anything to chip in please do

thank you
travis