Chugging/vibration/noise at highway speed

Took it for a highway cruise. Dropped it in neutral, vibration continues in neutral. Seems to be in the front end and the drive train. Noticed the hood shaking in neutral at 60 mph engine idle. I also dropped it into 1st gear from a stop and ran it at 40mph at 4000 RPM for a few blocks, no vibration. Engine seems to be running just great, no complaints there. I think I need to bite the bullet and fix up the suspension with bigger torsion bars, a larger sway bar, better shocks, leaf springs and rear shocks. Also need to replace u joints and the transmission yoke grommet/rubber sleeve (it's cracked and brittle). It would probably help to put new boots and rims on it. It has the original steel wheels and the tires are from 2003 (18 years old!).

I did spend money on the steering linkage and had all the bushings replaced and alignment down when I first got it. Even has a new steering box.