R5 p7

Try Arrington Performance. They have worked a bunch of these engines. See the link below.

http://www.shophemi.com/p-209-refreshed-nascar-r5p7-race-engine-358-ci.aspx
arringtons would be my 1st choice,..joey been in on these engines since development before mopar ever even came back to nascar,..need some nice port work done,my brother was best head porter on the cup/mopar scene...