69 Swb Opinions and Info Needed

[tutone]

Ok fellows, after moving the shop truck out, I have moved another in to take its place. It is a 69 custom 10, 115 swb factory fleet, WAS a six/PG (no engine currently), manual brakes and steering, PS box has been added at some point. The old truck isn't all that bad rust wise, needs a little here and there, I guess. Factory white/lt Green. That's it for options. The PG still is in the truck, although the current condition is unknown. It was running a sbc when the front left side suffered some damage, so I know it was pulling then. Have no idea on the rear gear ratio, although PGs mostly used 3-73 I think. Here is the deal. An LS swap is not an option, just not a big fan. I have in mind 3 different powertrain configurations and would like to hear from some of you that are running similar drivetrains.
A. I have a nice little 327 long block, cam it and slide a t350 in and regear.
B. I have a 283 /2 bbl I can put in and use the existing PG
C. Buy a 454 , heat it up a little and put in a t400 and regear
Those are the options, It has to stay an auto. I will add vintage air and PBs at some point. Who has ideas and any regrets? By the way, this one is a keeper, so Its gonna be here a long time. Here is a couple of pics.