Bolt patterns are the same, but it sounds as though you may have a cast crank in the engine. You may wind up with a balance/vibration issue if it is and you use a neutral balanced flywheel on it. Seems I remember reading here on the board that engines intended for manual transmission applications always got the steel crank. I believe you will need to roll it over, mark everything, remove the crank and have it machined to fit the flywheel. Then balance the flywheel to the crank, although you may need to know piston/rod/rings/bearings weight to pull that off.
Just my

Jess in ky