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You may want to drain rear end fluid to refresh. In which case you can take off cover and read the ratio numbers on the ring gear (google ring gear). That will tell you the exact ratio. You can also observe all the gear teeth and if it is a posi. The pinion angle is the angle of the drive shaft to transmission tail/yoke and to differential yoke. You will probably be OK. That's where the Ujoints are and are not to be stressed with crazy angles. Google pinion angle. The SBC mounts are usually on the side of the motor biased frontwards. They have a thru bolt into the frame mount half. google some SBC install pictures to see if you have correct frame mounts. You will need a transmission cross member for your automatic. If you are not up on this stuff you can just study the internet and read many how-to's with pictures. We are glad to assist but you need to buff up on the terms and procedures a little.
You can spin the tires and get a rough ratio and determine posi(traction), but inspecting differential is my suggestion with an unknown truck. You can't beat a 700R4 for your mentioned use.