Comp cams xe268h for 318

Ok thank you that is very helpful that will help norrow it down!! Will a cam 218@50 and smaller still perform the same with lower gears? I have a 8.8 with 3.73 packed away I plan on using later but I want to run my 2.76 for now so I want to choose a cam that will work well with both but most definitely not loose with the 3.73 if that makes sence I'd rather get a cam that will increase performance with a lower gear than loose since that is gonna be my permanent gear eventually.
Here's your answer on a low budget. You will install the rear end eventually. Why not now? A teen with a 3:73 willburn tires for a city block. You might not get 20mpg/Hwy so don't expect that. There is no magic bullet here.