My 68 chevelle has real bad wheel hop. I am thinking of boxing the lower control arms in, or buying new already boxed? and should i get new upper adjustable control arms ? any ideas would be helpful.

Yes, boxed lowers would help.. I run boxed lowers, no-hop bars, and the factory sway bar and I get NO wheel hop what so ever...

The frame supports also help. Here (http://www.classicperform.com/Store/1964_1972_Chevelle_Elcamino/1402.htm) is set sold by our site sponser.

I just roll with the Factory RPO F41 Suspension package which was an Option for Chevelles with Posi.
Factory job was to not Box in Control Arms, so we're replacing the Bushings (OEM) and Bolts (OEM) only.

Boxed In or not, this is entirely ones Option.:hurray::thumbsup:

The best setup we sell is the Hotchkis rear arm kit, adjustable uppers with the frame brace kit.

The adjustabel uppers will allow you to dial in the pinion angle, lower are a million time stronger than fact so they won't twist and bend when loaded (eliminates wheel hop) and the frame braces tie together the upper and lower arm mounts at the frame....Its a GREAT setup and we haven't had one customer that didn't like it!

Let me know if I can be of any help in designing a system or if you need pics/more data