4 speed, 8 3/4, gearing questions

ok, I’m going to ask several questions at once and hopefully this will make sense. I have a 64 slant Valiant w I assume is the original 7 1/4 rear end. I found a 3.09 4 speed A833 gearbox Im going to try to use in it. I also have a D100 2wd truck frame w a SureGrip rear axle that is geared 3.23. I am not sure but was under the impression that I can swap out the innards of the rearends and use the SureGrip( someone please tell me if that won’t work). Further, it’s gearedat 3.23.... what can I expect from this setup? Any input is welcome...... All of these things are out of my comfort level because I’ve never done it before. TIA