how to make 360 more torque

Search the classifieds here for a dual plane intake manifold.
A 600/650 CFM carb. Holley VS or Edelbrock AVS, your choice.
A cam is a great idea, if you need springs with it, add $100.
I like the previously mention exhaust size. Summit sells inexpensive kits that in include mufflers. They fit to headers which is difficult I understand for your year car. If you can find them and it fits your budget, there a good thing to add on to the build.

On the flip side is exhaust manifolds, but getting a 2-1/2 exhaust to them may not be in kit form and therefore expensive, Exhaust budget could be breaking the total budget.

Also add a good ignition system to fire it all off.

The exhaust and ignition are worth stretching the budget.