SB 4spd bellhousing 5.125" or 4.807" index

Casting number 3743859 should fit 75/76 A bodies, 75 to 80 F bodies, and 76 to 80 trucks and B Bodies with the right clutch fork. Should have an bearing retainer index of 5.125 inches. This bellhousing was used behind overdrive transmissions.
What's your application?