66 Dart 360 Swap Questions

The stock 360 has so much low-rpm power (compared to other stock SBMs that in your lightweight-A, you won't actually need true duals, nor even headers. But if you go that way, and take advantage of the 360's torque, then at least, you won't need large diameter pipes.

Furthermore, for a streeter, if you leave the cam stock, It is possible, with the right combination of cooling system parts, to use the factory 6-cylinder radiator ......... a thing that I have successfully done with even a high-compression 340 using a 318 cam.

However, all that torque, if you use it regularly is eventually gonna smoke the 904 ............ so you might as well build it up now before you install it.
and
don't be peg-legging the 7.25 rear end. Either put a Limited Slip in now, or put fresh fluid in it, and take it easy on her. If you drive it like it still had the slanty in it, it will last at least as long as if the slanty was still under the hood. lol.
Sooner or later, yur gonna wanna floor that 360, and the peg-legging 7.25, is gonna give up the ghost. If it spits the cross pin out, and jams up the case, the rear tires will stop turning. when that happens at speed, you loose your steering. If that happens in traffic, that will Not be good.
If yur lucky, the spiders will just seize onto the crosspin and then you have a spool!
and
unless yur idling around every where you go,
yur gonna need more rubber. Those skinny donuts are gonna get you into so much trouble.
BTW
nice car