Only to a certain degree. If the shape or size of the panel is not correct (meaning repop), it won't fit the contours of the body no matter how hard you shim. After seeing my bodyman take the front clip off and on my '67 about 100 times, I understand the fit issues. And I was working with rust-free original parts and NOS GM fenders. The repops are way worse than that, especially the front sheet metal and repop bumper.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold