Thankxx, I think the width was an issue also but not 100% sure on that.......
I remember some guys doubling up the gaskets to clear rockers BUT I forget what rockers on BB... on my covers I had to mill the outer(lower edge) to clear my springs.. I am using 1.65 OD and things were hitting before I milled the lip... plus I had to clearance the gasket.. I use the MP silicone over a steel core.. life time ones)... all extra work to run that diameter spring... even the 1.55" OD spring was gonna hit or be very close