swinger 360

The man is right. Just get'er in there.
The /6 suspention will do. You can upgrade to stock 340 bars and springs from MoPar later.
On my first owned Dodge Magnum, a '79 with a 360/904/2.76 combo, I added a 340 trap door air cleaner, 625 Carter AFB, factory T-Q 4bbl, dual exhaust mandrel bent @ 2-1/4 inch with an H pipe and for the time, twin cats because it was needed.
Being a lean burn car, I fired the Lean burn and terminated it's services in favor for a junk yard distrib and MSD 6A box. The tires were 235/60/15.

Tunes and takeing it easy, read with traffic driving (65 or less) I nabbed 20 MPG's Hwy.
No headers, no aluminum intake, no overdrive, faster than stock stangs with better mileage and more steel.