Is it an original 4 speed car ? If so do you know if it is the original bellhousing and engine ? the original bellhousing and engine were machined together .

That said it would be a good idea to check the runout and correct it , DO NOT use the lakewood or MP offset dowels , they are FORD dowels and do not fit properly , plus once you hammer it in you can't spin them .

RobbMc sells offset dowels , if you need them use them .