Intake gaskets.....

Hey guys,
I have a Magnum swap in my 69 A body.
Im currently using the Edelbrock 7577 Intake..
question is,what intake gasket can/should I be using?Edelbock recomends thier 7277.Thats great But I need one sooner and would like to use a Fel-Pro part #.
Is the Felpro MS953921 the same port dimensions?
Any help would be great!