M1 or Port-Matched LD4B on 408

Hard call because the fuel distribution on the M1 intake can be fixed, enhanced and ported for higher flow way over the dual plane. And yes I’d call it restrictive. Even though there very good intakes.

But the low end trade off could make you unhappy in the street and strip considering you have a small cam inside of the engine. And that “small” is for ether cam listed. A hair more so being it is a 4 inch arm stroker.

I don’t know how well the FI will be on the dual plane. Try it, what the heck! Do you have the M1 single now? If you don’t, wait on the purchase.