Adapter
In 1996 I sent my 4150 Dart intake to Shafirof to be ported and fitted for a dominator for my 572 . When I received it it had the adapter, I freaked. Anyway I was told to send it back and they would cut a big hole in the top to direct mount the 4500 carb and lose power. It works for us( I think) but this is all I ran. One thing for sure, there is extensive port work on the adapter and the top of the intake where they are blended together, thats 11 yrs ago, and now I see a lot of others doing it to,(Reher Morrison) funnel ram for one, good luck.