i rebuilt and built up the trans then put in a 383 vortec now its time to build up the rear end to handle that 383 i have the stock 10 bolt with 273 gears i thought they where 342s but what ever i wanna go with 373s and a locker scince its limit slip right now i want a full posi but after searching for what to get i have no clue on what locker is right for my set up and what i need besides that

What are you using the car for ? A full posi. as you call it is actually called a spool and used for track .(1/4 mile straight line racing).Limited slip/posi. is used for road racing and street/strip .If its track with hard launches than 9" OR 12 Bolt may be in order.

You are probably going to break the 10 bolt, but if you want to build it then use a 28 spline Eaton Posi and a set of 28 spline axles. Your 26 spline axles are too small.

Limited slip and posi are the same thing. What you have right now is a standard differential.

its a street/strip car i just dont want something like i have now that will kick out to one wheel

Get a Detroit Locker. They never let one wheel spin alone, but still work fine on the street.