Vibration:
At idle motionless it's the same as at idle in drive. Driving at speed it's difficult to tell, I would say it's the same.
It is the same with transmission in park as in neutral.
It is less noticeable when driving.
Slowly increasing revs doesn't smooth it out. I held my hand on the air cleaner and I can feel it slowly dissipate, meaning the sound/rpms of the engine start to mask it, but it doesn't go away.
I checked the trans to engine bolts, just because, one was a little loose, no change to vibration.
Radiator is secure.
Checked entire front end, nothing loose, rattling, broken, rusted, etc. Bumper doesn't budge.
As far as I can tell, I don't have slack in the valvetrain while manually moving the crank back and forth. I've done it multiple times trying to get tdc exact.
Yesterday was a good day. It drove better than ever, plenty of pick-up, kickdown worked great. Motored along nicely, even with that 2 barrel, it goes. Power steering and power drum brakes work excellent, heater is the bomb.
I'm not sure if this will be of any help.
I used a spark plug to demonstrate where the vibration shows up.
Top of air cleaner, very front part of fenders, front cross brace, and the upper horn. The horn looks like it's going in and out of focus, but it's not, I watched it vibrate in person and on my phone at the same time.
Can't really hear it, but can easily feel it.
Not on radiator or middle/rear of fenders.
Today I felt it in the driver's seat for a short time while it was idling.
