Vibration in engine- help!

Wires are new, and I just bought plugs so we will see.
At the beginning of the summer I put the high rise intake back on it, the one the car had on it when I bought it. If oil is getting into the cylinder from a bad intake gasket it must be seeping from the bolt hole into the runner; I guess. These high rise intakes don't leave much room to tighten the bolts, but I did use a little rtv on them.

Supposedly, the heads were rebuilt some time ago, not that they could not be the culprit. I'd like to do a compression test asap, so as soon as I can beg/borrow/buy one I will.

Thank you everyone for taking the time to read this and educate me. I learned a great deal and I was able to identify the issue.

If I discover anything new I'll definitely post it.