My truck is quite un-stock as well.
Late 60’s Camaro front stub, lower portion of cab& entire firewall replaced, etc. Inner fenders are repop. I’m thinking that the Frankenstein factor is part of my fitting problem. I’ve taken that danged hood off and put it back on too many times, replaced & reset the hinges. Even went through the trouble of finding and buying original springs. The fasteners on the passenger side are extremely hard to work with because of the heater , and that heater is not coming out.
I just don’t want to deal with it anymore.