Can you use a 360 converted to natural gas in a 74 duster?it looks like all you have to change is the intake.but it is an 01.do they make carb intakes for an 01 360?

The 2001 would be a Mag 5.9 engine. Though it shares several features with the 360 it is enough different that I prefer to call it a 5.9 Magnum.

A 5.9 Magnum has several options for an intake manifold:
1. Edelbrock Perf RPM
2. Crosswinds carb intake
3. Redrill the Mag heads for the 360 intake bolt angle and bolt a 360 intake on it
3a. Elongate the 360 intake holes and use angled spacers to bolt the intake down
4. MP fuel injection single plane intake, there are at least three
5. MP dual plane intake
6.etc.

Now for my main question: Is anyone out there building a natural gas fuel injection system? Could be a real barnburner.

Edit: Standard Motor Products and Omni make electronic CNG fuel injectors that look like they are the same configuration as "regular" electronic injectors. Now where's the controller? Think about it, Methane has a very high octane rating, the fuel expansion cools the intake charge, no pump is required because it's in the tank at 2000+ psi.

R.

My local salvage yard has 15 ngm's all 360's with low miles.I can get one real cheap.And i need a motor for a 74 duster i just picked up.It looks like i have to change the intake.im hoping the normal distrbutor will work in them.also do they have the same bolt patern as a la motor?for the bell housing.and are they externally ballanced?

ngm?

I think he means natural gas motor. But he could mean normally goofy mother@@&$)(, too.
There are problems with other nomenclature as well.
Now I am reading the question as can I convert a natural gas 5.9 Magnum engine to gasoline and put it in a Duster?

Dude, if this is indeed the question here're some answers.
First of all even though a 5.9 Mag engine has the same bore and stroke as a LA 360, it is not the same engine. It has a very similar block that will bolt into the Duster like a 360. It will bolt up to a LA transmission. But the amount of factory imbalance you need for torque converter is less. The cam is hydraulic roller and stock Mag engines have no provision for mechanical fuel pump. Doesn't matter the Carter electric Street Pump is better anyway.
You'll need a distributor from an earlier engine.
The intake I covered earlier.
Carb is your choice.
Headers or exhaust manifolds may work but bolt up the same as LA motors.
Heads are different but a lot better and compression should be 9:1.

I'd be very interested in seeing the natural gas injection setup.
R.