The Saginaw 4spd is a direct bolt on to your 46 216 or 235 using your original 216 or 235 bell housing. Patricks sells a Hurst 4spd shifter and linkage along with a special shift lever that adjusts for the slightly rearward shifter location.
T5 is also a good choice...5 speeds (OD) and an integral shift linkage...mouniting bolt holes need to be made 1/2" (currently metric), input shaft needs to be shortened and clutch plates need to be tweeked.shifter location is 7-8" back from original.
al. Master cylinder location needsa to be reworked.

Steve G.
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1942 Chevrolet 1/2-Ton Pickup Truck