Hi folks,
I have a few questions for both my peace of mind and understanding of things.

Last night on a 20+ mile drive home, I noticed a kind of slow wobble/vibration under my foot. Like the car was going over equally spaced bumps. This seemed to happen consistently around 60-65mph. At first I thought it was the road surface but later I realized, it felt like the throttle pedal assembly and other front end components were being shaken- at a slower rate than engine wobble motion (which is why i suspected road surface). I timed it and it had a pulse of about 130bpm.

1. Does this sound like some sort of front end issue?
2. Or could it be that now that my mounts are better and stiffer, some kind of engine vibration is being transferred to the linkages and such and the problems is in the engine?
3. What does a failing anti-roll bar feel/sound like?
4. Harmonic Balancer. I understand its purpose but how would one know if its on the way out?
5. Can the harmonic balancer cause slow vibration?

I ve recently managed to make my car modestly pleasant to drive and live with. OFV spring, fuel system cleaning, lift/primer pump, mounts, linkages etc. I really hope its nothing and just my imagination and road bumps.

Your help and suggestions are greatly appreciated.