Do you have studs or bolts on your valve covers? If you have studs you MAY have trouble getting the passenger's side valve cover off.

My car flexes enough that if I jack it up and take the weight off the front suspension, the valve cover can be removed. I do have valve cover studs.
If it's sitting w/ the weight on the tires, the cover contacts the shock tower when I try to lift it off.
Hopefully yours doesn't do this since you have snout bars on your cage...wish I'd done that.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax