I would suggest 1 7/8" Hooker super comps., they come with stahl adaptorplates (7 bolt conversion) that is what i have on my 377" on alcohol and i also ran them on the 406" before i broke a rod bolt. They work well and are inside the frame on my Malibu, but i did have to install turn outs to keep the fumes out of the car.
JMO
Zip.