You are in a world of hurt. You have probably come up with the most difficult swap there is . If you are lucky, the P25 block will be a 230 and has 8 holes in the crankshaft. Otherwise the fluid drive will not fit. If you are going to use a Hydrive, then the block must have the necessary passageway for return oil to the pan, and machine work to seal the end of the oil gallery to the Hydrive adapter. You cannot use the truck bell housing pictured without ruining the car. A Plymouth bell housing will work if you cut and move the crossmember and change ALL the linkages and lengthen your driveshaft.
Re read the posts above, Greg, Young Ed and Duly seem to have been there. ( years ago I had a Hydrive car which needed a new block , I could not find one and wound up.... shame on me... installing a 283 Chev.)