I need some information.

I wouldnt suggest using a 273 manifold. Go with a aluminum Edelbrock RPM or Air-Gap. Some grind the Edelbrock off the manifold to look stock.
Not sure what carb you have ?

If I remember right,only one side of the magnum manifolds will fit in a A-body.
Thats to bad because they flow as good or better than Hi-Po 340 manifolds.

340 manifolds work well,although pricey $. 273 or 318 manifolds will choke the 360 big time. Headers might be be the answer.

Here is a pic of the 360 I put together in my Dart. Built it as a 340 clone.
360 block,Edelbrock RPM, Edelbrock 600 cfm, Comp xe268,340 Manifolds.
Runs very well.

faucet pics 827.jpg