Cam & engine gurus gtf in her meow!

Where you got lost was not knowing this;
At low rpm, your engine does not start to build compression until the intake valve is fully closed. Compression is what makes power.
If you install a "bigger cam" with a presumed to be later closing intake valve, your engine will make LESS pressure, which translates to an immediate loss of power, at low rpm.
Camshafts are sized about 6 to 8* apart, like;
250/256/262/268/276/284/292. The intake closing point on each of these is delayed about half the difference in size, or say 3.5 to 4 degrees. This moves the operating rpm up about 200rpm, and it is the improved efficiency at the new higher rpm that makes the power.
But to do that, the cam gives up pressure at low operating rpm. The loss is about 1.5 psi per degree. A low compression engine,with no other changes, will immediately get lazy down there.
That's NOT what you want, is it?
A Thumper/Whiplash type cam will drop a lotta lotta psi at idle. And won't start to get it back until you wind it up. That's all good if you have a high-stall TC.
So
since you need a hi-stall anyway,
You might as well start there.
And since a 4bbl and bigger cam, are gonna start processing more air, you need to get rid of that more exhaust.
And since in a lo-compression engine,the bigger cam won't wake up until higher up the rpm band, you will need more than 3.21s if you want to feel the cam.
Finally, that rumpity-rump you might hear at A&W comes atta price. That is the sound of low-efficiency at low rpm. Which is the opposite of street performance...... when married to a 3-gear TorqueFlite. You won't get that sound with one cam size. It takes about 45 degrees of overlap to introduce it, and it is not until 70 or more degrees to be really noticeable.

I can almost guarantee you that in your truck, with no other changes, you will hate driving it with a cam big enough to have such an idle.
I can almost guarantee you, that, with no other changes, you would love a 2800TC. You will slap the gas pedal almost every time you leave a stop.
For you, You might like the Thumper/Whiplash cam, but it won't be in there long before you will want a TC and most likely gears as well. And of course, the Whiplash wants headers, a free-flowing exhaust, and more cylinder pressure (pistons), to get the best out of it.
And for as long as it is in there, it will drink gas, like camel drinks water