That is about the best all around intake for efi (imo) The whole 351 thing with that intake is way old school. I used the truck intake gaskets all the time because they were the same and cheap.
I had the Downs box on my wagon with the s-trim, i liked it but it took alot out of the bottom end.
__________________
handle every stressful situation like a dog: if you can't eat it or play with it, just pee on it and walk away.