i had this problem today on my 347 first make shure you are trying it with the gasket on there silly i know but it happens and if that is not the problem then there is a plate under the oil fill you can take out that may provide the clearence you need that worked for me i have the similar covers on top of 1.7 roller rockers
pretty much take the baffle out, but watch for blowback into your intake. i got a 03-04 cobra oil seperator kit from steeda to keep oil out of my intake