It's a 91 that has a 4 cylinder,5 speed short bed.Son is 16 and wants to bracket race in summit high school class and street class.I'm using a 71 360 block,.060 over,scat I beam rods,icon forged flat tops,ported 2.02 j heads that went 10.8's on my demon,rpm air gap intake,hp 750 holley,904 with 10" ati.I was hoping someone made a bigger header than 1 5/8".My experience with hooker headers is the flanges don't match the heads very well.When I searched for a oil pan all I found was 318 pans.Anyone know what these trucks weight?Thanks