the power gains from inserting the fuse are truely astronomical. i recommend using it at all times. removeing the driveshaft and rear diff and rear shafts will also save weight and improve mpgs.
after this gut the interrior and replace all windows with plexiglass. if you havent seen amazing huge gains in hp and mpg then you should start thinking about cutting out some of the body reinforcement members. after all they add alot of weight, and the best way for gains to to shed weight. you can also remove the entire dashboard. just use jbweld to mount the cluster to the firewall. dashboards are heavy so you will see gains there. good luck.