360 does not seem to be making power and is slow in the 1/8. Need help and/or suggestions

I strongly disagree in throwing parts at it such as heads.

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I agree.

There appears to be two issues, which may or may not be related.
A- won’t rev
B- 60’ sucks

I wouldn’t make any changes to the “combination” until you figure out why it won’t rev, and then fix that.
Most likely some sort of ignition issue.

After that’s solved, go back to the track and see what it runs.
There should be a big improvement in MPH.
If the 60’ times still suck, and it’s not spinning, it’s likely time for a converter.

But imo, step one needs to be getting it to pull cleanly into the upper rpm.