answering your questions in order:
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location of the column firewall hole will be in a flat location and if the inner shaft is long enough to reach the gearbox
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assuming you are talking about doing an s10 swap and thats how you will have an s10 steering box, you dont need to worry about this much because there is no chance the steering shaft will be long enough and it will not point anywhere at the s10 steering box. what you will do is use the "column saver" bearing kit (dont just pop a bearing in there, it will not have any provision for thrust, which are in/out, loads) available just about anywhere summit speedway jegs, then you will either use a u joint that fits the round column shaft diameter (I think its 3/4 round) on one side and a DD shaft (usually 3/4DD) on the other. then a 3/4DD to 30 spline u joint at the steering box, and a length of 3/4DD in between. this will cure the misalignment of the bottom of the column to the input splines of the s10 box and it will feel great steering it.
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Is the steering wheel splines and taper the typical size?
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yes, GM steering wheel splines have been the same since 47 all the way through the 2000s. usually if you use a 63 or newer factory steering wheel you have to drill a new 3/8" hole at the 11 oclock position for the horn spring to pass through, but its likely (not impossible on a 54 column) your old column wont have a turn signal cam to worry about and you can just center the steering wheel using the splines on the s10 box. if you do have a turn signal cam on the 54 column, gm changed the horn spring pass through from the 2 oclock position (47-62) to the 11 oclock position (63 up) so you will need a hole to keep your cancel cam working correctly.
good luck!