Bellhousing

One more thing;
Have you considered your slowest driving speed with a 4-speed?
Typically; with a 2.66low, and 25.5 tall tires, and 3.23s; your slowest speed (not toeing the clutch) is 700rpm=6.2 mph/ 650=5.75mph
Parades are done at ~3.5 mph or less because that is an easy walk for participants. Trying to drive at 3mph with a clutch is a real challenge. With 3.23s this comes to about 320 rpm with 3.55s and 27" tires, in the regular A833 with a 2.66 low gear. Yeah/no, that ain't gonna happen.
The closest I got was 4mph = 550 rpm with 27s, 3.55s, and the Commando box with it's 3.09 low gear. For parades I got 4.88s or 4.30s.
With 4.30s; 3.5mph is 580rpm, still a stretch for a 230* cammmed 367 . But with a diaphragm clutch and 340 pedals, it is just doable, so long as your cooling system is adequate and the cam lobes get oiled.

There are two pedal ratios; one for slantys and another for 340s and everything else, which I will call the 340 pedals. IDK what ratio the 318s got.
If you try to use the slanty pedals on a B&B HPclutch, you will need a stout left leg. But it seems to work ok with a diaphragm clutch.
But, at 5* Idle-Timing, and with 340 pedals, and a diaphragm clutch, then you will have a very nice time modulating your take off, especially with a 3.09 low gear.
And parading, if not easy, is at least doable.

Ok so what I'm saying is that; if operation at slow speeds is important to you, then it is VERY important which transmission, and which pedals, and which rear end ratio, you use. Don't be like me; I got a pretty good selection of obsolete stuff on my shelves that didn't work out for me.

My Commando guts came from a 64 which had a tri-pot driveshaft.IDK if the Commando ever came with a slip-yoke. In any case, I had to supply a used mainshaft and the appropriate tail house to make it work in the 67 and up cars. For me that was not a big deal, cuz I already had a collection of blown up boxes to steal parts from to make it work.

I used a B/E body tail, which is the same length as the 727. But I had buckets and moved the shifter back about 6 or more inches. This required the fabrication of a new adapter-plate and longer shift rods. Since you do not yet have a floor hump, this could be ideal for you. You will still have to cut open the floor to make room for the shiftrods,but you can patch that without a hump. You will never again smash your knuckles into the dash on the 2-3 shift.

Happy HotRodding