the tranny should be fine in your swap..... but im not sure about your engine mounts? where are they located on the V8 that you are using? what year is the 318?some where about 1990/91 the engine block was changed? if the insulator bolts to the side of the block like a SB chevy i think you will be ok, but iff its like all the older V8 SB your may have to make the engine brackets aswell..