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Looks like torque is the same but at a different RPM.

Cylinder heads, camshaft, intake and exhaust manifolds are the differences. I stand corrected on the heads and intake. https://musclecarclub.com/ultimate-chrysler-383-mopar-engine-guide/ "The High Performance and Truck Variants of the 383 From 1968–1970, there was a high performance version...

Here is the link for free service manual downloads. https://mymopar.com/service-manuals/ Section 3 Then just print the pages you want to use and you will never have a dirty/greasy manual.. Make sure to clean, inspect and repack the rear bearings. They are not lubricated by the diff fluid. And...

You said you checked the rings. How ? If you removed the pistons, it will be impossible to get the rings back in the exact same orientation. They wear oval shaped so would need replacing if removed from cylinders along with at least a cylinder hone.

Factory procedure is to make sure it is on a level surface. Set parking brake. Start, let run at least 2 minutes. Run transmission selector through each gear for a few moments ending in neutral. When at operating temp check level. Should be between 1 pint low and full. ATF+4 fluid. Then do your...

First clue was using a hammer.. If it doesn't slide in you stop. If you don't know what you are doing, how do you know it looked good ? Good to find someone to help you that is familiar with differentials and get a Service manual before you do any more work.

742 Very strong, easier to setup, no crush sleeve needed.

318/340 forged rod same casting number. Both floating pins. Click on link. http://www.mopar1.us/Aengine.html#:~:text=interference%2Dfit%20screws.-,ROD%20INDENTIFCATION%3A,0.9480,-CRANK%20SPECIFICATIONS%3A

1 bad, all are bad. Just some are worse than others.

Is this like the rear tires on my race car only have 5 1/4 miles on them and are worn out ?

Measure it.

"Power timing" is for hi rpm driving. like pedal down, track driving. Advance type doesn't matter since the timing is already all in. Ported, is for street driving. You set the initial with the vacuum disconnected and blocked. Timing curves will depend on what distributor you are running.

Be sure to save it if you decide later to go back to factory style bearings or list it for sale or its measurements for those trying to find one.

Use new flex plate/converer bolts and torque them to specs. Cheap insurance.

They just make radio static...

There are now 1 piece hub/rotor replacements so you don't need special studs or swedging tools. 1966-1969 Mopar B-body 11 inch front disc brake rotors.PAIR

A simple preventative service that most members may not be aware of is that the tapered bearings need to be hand greased occasionally. They are NOT lubricated by the differential fluid.

MMC Detroit

A lot of weights on that drum. studs look nice.

Show us photos of your problem.