318 to 360 swap crank pulley issue

[iw378]

I am re using the crank pulley off my teener for my 360. Only 5 of six bolts will line up. Is it acceptable practice to slot one hole about an eight of an inch ? What are my options, 318 is a 1970 and 360 is also a 1970 cast date if that helps.
Luke

 

[iw378]

Never mind, March performance pulleys have one slotted hole so I'll fire up the die grinder on the Oem one

 

[SGBARRACUDA]

Yes, but then you already answered your own question.