Affordable Handling Upgrades?

So here's the current plan:

Step 1: Brake inspection / maintain the drum setup as necessary
Step 2: Complete OE front end kit and new shocks (looking for recommendations)
Step 3: Subframe connectors
Step 4: Leaf springs (new? recurve?)
Step 5: Front sway bar

Step 1 and 2 good to start of with a solid suspension,
Why do you think you need springs before torsion bars,
Really as long as your car never bottoms out you can set up handling with just sway bars but it easier to spread the load between the two, the front end does 80% of the work I'd do front sway bar and torsion bars then work work on the back to make the car neutral no over or understeer or just a slight oversteer. Some setups don't even need a rear sway bar. Lowering the car helps a lot but requires more spring rate so it don't bottom out and don't go more than 1.5% rake.

After 1 and 2 on your list I'd go with tire cause tires make the most difference, big and sticky, then sway bars then torsion bars leave leafs to last to see what you need to balance it out.