You'll need talls, something like the pent proofs 4sale in classifieds. I ran into that problem with my 390, ed heads and erson rockers and I'm also running a 605 lift solid comp 294s, I did find a set of 428cj alum factory covers that clear I did have to remove the baffles, they wont go between the rockers.
these wont fit lack about 3/4"
These fit good and what i'll use