360 vacuum leak.

Bewy said
1977 engines were low compression. Not a good candidate for a performance cam.
Do what RRR said in post #8 to see if you have a vac leak; I doubt you have. Be careful when spraying around the throttle shafts because they have clearance & fluid will be sucked in & there will be a change in the engine note; this would be NORMAL, not evidence of a vac leak.
I suggest you try this & report back. I suspect the engine has 'a cam' in it & just needs tuning.
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My block is a 77 but I really don't know how much of my engine is in its original configuration. It's in a 55 Plymouth with lots of custom fab all over. From what I can gather I believe a lot of the parts used probably came off of a Dodge truck. I don't know if any of that is helpful information but I'll be back with the results tomorrow hopefully.