Valve cover clearance with Hughes roller rockers

I have the MP 1.7 roller rockers in an otherwise stock 360 mag in my wife's Durango. I was hearing they'd clear then hearing they wouldn't, depended on who I asked including the guy who I got the roller rockers from. He'd said he hammered the baffles in on factory valve covers when he had those roller rockers on his.
I found a guy on ebay selling billet spacers in varying thicknesses and I didn't want to d*ck around experimenting, so I just went ahead and got a set of them. I had to run 2 valve cover gaskets per side (one above and the other under the spacer) but no problems. Who knows the double valve cover gaskets might have been enough.,...
I'm running the stock original cam. The spacers were ~1/2 the cost of the MP aluminum valve covers which are "definitely" supposed to clear without issue.
The guy's name is medice manufacturing out of PA.
When I got these he had them in1/4, 3/8, 1/2, 3/4 and I believe 1" thickness for many common engines. I went with 3/8* spacers.