👍🏼...
Ah, ok..that's with the 4 bolt carb was new to me too.
The Dynaslow will not fit to the lenght of the '37 Torquetube, I think
Also you will be not satisfied with the OEM rear end ratio of 4.44 because of the additional slip in the Converter instead of the direct 3rd speed on a manual transmission.
My suggestion,
Take the 37 flywheel, 4,0 Cherokee Clutch,and the 263 to a machine shop, they can make you a Flywheel with the boltcircle and center hole from the Dynaflow Crank.
Starter ring you can get new from Bob for shrinking it fresh on the new Flywheel.
They can also machining you a adapter insert inside the Crank for the installation of a pilotbearing from a 95 silverado.
This adapter is on outside like a cone, you press it into the crank and tack welding it on outside for safety.
That's like me has done this.