yes the hydro clutch bell housing from the v-6 bolts to the SB v-8
you can use the v-6 flywheel on a 318 v-8
there are a few differnt trans to pick from for the 5 speed.
ax-15 which has the 9 bolts holding the bell to the trans
a535 which is looks close to a 833OD unit as far as size fit
nv 4500 5 speed which is a low 1st gear and close to a 435 granny 4 speed in size. slightly bigger with 5 th gear.
I am in the middle of the same thing, adding a 5 speed to my D-150 stepside.
I have the v-6 fly/bell/hydro system from a 88 d-100 truck, 92- d-250 2x nv4500 5 speed trans.
IMHO, the a535 or ax-15 would be the best fit in a car, both will need xmember and trans tunnel work. but the a535 looks to have been the replacment for the 833/833OD 4 speeds in the 2x v-6 and v-8 trucks.
now the kicker...if you go with the a535 make sure you get a shifter with it. this trans is a pink elephant with a golden nugget shifter.
if you even find the trans with a shifter it is anywhere from 650-900 bux. you can get a reman for 650$ with 12 month/unlimeted milage BUT NO SHIFTER!
I moved to the next trans the NV4500 5 speed for the trucks.
the ax-15 from a DAK is the 2nd choise in a car IMHO, it is small and has it own v-6 bellhousing with 9 bolt retaining the bell to trans...also have them with intergrated bell and trans case(none removable bell.
here are some pics to ID them, first up is the BIG$$$ light duty a535