65 Chevy Truck Suspension question

[wildearp]

I have a '65 short bed I am going to build next. It is already lowered a bit with springs, has drums, and has been updated with power steering. I have a mounting plate to install the steering box correctly and strengthen the frame, but have not installed it, yet.

My question is about why I would want to go with the trailing arm upgrades for the rear and the tubular arms and all the gear for the front. I can quickly install a Mustang II and a 4 Link on other vehicles (in one weekend), but I don't see similar kits offered for the 1965.

The upgrades to the stock 65 gear seem to add up to more than all new parts for a 4 link setup and a Mustang II.

What should I do?????????????