91 ford need info on what performance items i can use

hey yall I'm the proud owner of a 91 ford f-150 with 310000 miles on her. she still runs good but blows oil out of everyplace there is to blow so instead of fixing all the leaks individually i would like to build a long block to put in it/ well anyways i would appreciate any info on some mild performance part i can use with stock EFI i.e. cam, heads, crank, and pistons / have a budget of around 2000 dollars, would appreciate any tips yall have