The early models 4-speeds had ratios of 3.09-1.92-1.40-1.00. The 1-2 split is a bit wide, but allows a 14% reduction in rear gear for the same first gear giddy-up. This means you don't have to run 4.10, but rather 4.1 less 14% equals 3.55;surprise! Unfortunately IIRC this 3.09low gear set did not make it into the slip-yoke tranny, which means you will need the later mainshaft and it's tail house, and will have to do a bit of swapping.I have done this swap and can testify that the 3.09 gear will/does work very well with 3.55s. In your Lightweight gen1 car I would recommend 3.23s as being sufficient to launch a streeter with authority, and the extra gear will make hiway cruising much more bearable. The 3.09 x 3.23 = the same starter gear as 2.66( the standard low gear) x 3.75. The 360,any 360 will have no trouble pulling the other ratios in a 1st gen chassis.The teener, if built right will pull them too. The 273 will be fine in first, but will notice the taller 2nd for sure.It may like the 3.55s better.
If you go this route (long-tail 4speed), you will have to cut your floor up some. So,you guessed it,I would highly recommend that you put the shifter where you want it, and fab up the bracket and rods as required. The rearward mounting makes the 2-3 shift;lightning.It's easy and kinda fun and can be done in a day, without too many special tools.Of course if you have a bench seat and plan to keep it, then you are kinda married to the stock location.