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WELCOME TO FTE! I am not sure what you mean, "What front end do I have"? Are you asking for the gear ratio? 410 or 373? If your RPM gauge is @ 1900 @ 70mph you have a 373. If @ 70mph your tach reads 2400, you have 410's.
Is this your question?
Maybe a Dana 44 or 50. You should have a tag on one of the dif cover bolts. Those numbers will tell you. I don't know how to read them but if you post them someone will translate, I am sure
Dana 50 is twin beam, Dana 44 is twin beam in 1/2 ton trucks. Dana 60 is solid axle.
there will be a 50 cast in to the rear side of the differential if it is a 50. or a 44 cast if it is a 44