Help me find the umph in my 360

With 3.55 gears around 3000 rpm I'm at 50 mph.

That's about right with your short sidewall rear tires.

Lets hope it's just your Flex Plate to Torque Converter bolts that started working loose after winding up the fresh engine to 6000 rpm on earlier test drives.

Rod and Main bearing failures usually don't go quiet once they start knocking.

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I will double check those when I get home. But I think I might know where it came from. When I went around a round a bout this morning is when it occurred. Then I didnt hear it when I decided to risk it and take the car home. " I'm like 3 Miles away from work". I think my exhaust was tapping my transmission cross member causing it to sound mechanical. . So I'm going to take the exhaust off and bang it allitle bit to give it some breathing room also. I'm going to do a full under the car inspection tonight.