1/4" is fine for a 70s era car. Even tight for Mopar's body works...lol. But, it needs to be even the entire length, which yours is not even close. Set it at 1/4, and then the paint will tighten it slightly. Dont use filler like you see Boyd Cddington doing on any door edge or conrer. You're asking for repairs later. Also, you may need to modify some panel mounting areas to get the whole thing to look nice when you tighten the gaps. On a lighter car, I dont like big gaps. On a darker car, they tend to blend more.