What's wrong with adaptor plates?
I would get the hookers super comp headers with stahl pattern in 1 7/8" with 3 1/2" collector, that's what i run on my Malibu, the adaptor plates come with the headers and cost about $500.00 they are made for cameros also. That way if you decide to go up on the heads you aready have the headers, except for 18* heads
just my opinion.
Zip.