RPM doesn’t seem right

After completing a manual swap on my uncles 70 Cuda and driving it I've noticed what i believe is a RPM discrepancy.

3.55 rear gear, 27" tall tire, .68 over drive gear at 65mph the car is at 3k RPM but feels like its about 2k.

At idle it sits around 1,200 RPM but acts like it wants to die and sounds like it's really at 550-650 RPM.

Nothing on the engine was changed during the swap, the car has a MSD 8387 ready to run distributor and a MSD blaster coil.

I'm new to these cars but was...

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Author: Bstoker87