The Monroe shocks are junk (I put a set on my '69 when I first got it, changed them out for KYB, thinking of changing them out again for IAS or QA1).

What are your rim specs? Diameter, width, offset, backspace? What tire size?

If you suspect tire/wheel well interference, which is likely with your symptoms, use a pair of "roller skate" dollies under the front wheels and have a helper rotate the steering wheel lock to lock while you look for the interference point. Wheel to tie rod end and tire to inner wheelhouse are common. Tire to inner fender is usually accompanied by damage to the tire's sidewall or the fender lip. Look for smoothed undercoating or other signs of contact.

If you still don't see any damage, try jouncing the front end with wheels at full travel left and right. It may be hard to replicate.