The AMC 360 was introduced in 1971 in J-series pickups and Wagoneers. It has a cast iron block and cylinder head with over head valves and hydraulic lifters.

In 1971, the AMC 360 have very high rating. I would assume these are gross ratings and the later are net ratings.

 

AMC 360 V8
Bore x Stroke	4.08" x 3.44"
Displacement	360(5.89L)
Compression Ratio	8.5:1
Horsepower (gross)	245@4400
Torque (gross)	365@2600
Main Bearings	5
Valve Configuration	OHV
Fuel	2bbl

In 1972, the 2bbl 360 is more conservatively rated, presumably these are net ratings.

 

AMC 360 V8
Bore x Stroke	4.08" x 3.44"
Displacement	360(5.89L)
Compression Ratio	8.5:1
Horsepower (net)	175@4000
Torque (net)	285@2400
Main Bearings	5
Valve Configuration	OHV
Fuel	2bbl

In 1973, an optional 4bbl carburetor was available. The horsepower and torque ratings for this version are significantly better.

 

AMC 360 V8
Bore x Stroke	4.08" x 3.44"
Displacement	360(5.89L)
Compression Ratio	8.5:1
Horsepower (net)	195@4400
Torque (net)	295@2900
Main Bearings	5
Valve Configuration	OHV
Fuel	4bbl

The 304 used from '80-'81 in CJs, J-series pickups, and Wagoneers suffers in performance.

The '79 304 saw a significant drop in horse power from previous years.

 

AMC 304 V8
Bore x Stroke	3.75" x 3.44"
Displacement	304(4.98L)
Compression Ratio	8.4:1
Horsepower (net)	130@4200
Torque (net)	245@2500
Main Bearings	5
Valve Configuration	OHV
Fuel	2bbl

The 304 used from '72-'78 has the best performance of all the 304s used in the CJ. The 304 was not offered in J-series pickups and Wagoneers after 1972.

 

AMC 304 V8
Bore x Stroke	3.75" x 3.44"
Displacement	304(4.98L)
Compression Ratio	8.4:1
Horsepower (net)	150@4200
Torque (net)	245@2500
Main Bearings	5
Valve Configuration	OHV
Fuel	2bbl

The ratings for the 304 used in '71 J-series pickups and Wagoneers are gross ratings.