351W "Cobra" valve cover clearance help

[Okiesnake]

I have a 351W with RPM Aluminum Heads. I don’t have roller rocker arms. I have the “COBRA Powered by Ford” reproduction aluminum valve covers.
Even after banging the crap out of the tin splash baffles to get additional clearance, I still get the rocker arms tapping on the bottom of the tin baffles. Granted I could remove the baffles entirely but that would just end of throwing oil into the oil breather and eventually get on the outside of the motor.
I was considering either getting the spacers from Tony D. Branda (example of in link below)
http://www.cobranda.com/GetItemDetai...D=346&DeptID=6
or
the Tall “COBRA Powered by Ford” reproduction aluminum valve covers (example of on link below)
http://www.cobranda.com/GetItemDetai...D=346&DeptID=6
HOWEVER, I thought I recalled someone saying that these were too narrow or something to work with aluminum heads? Does anyone have any input or experience on this? If they would work, I think I would like to go with the “Tall” covers instead of the spacers because they would only require 1 set of gaskets. (less chances of oil leaks)
Okiesnake