You are speaking of a gear drive.
I am not sure, I have not looked for one.
You can score a 4 brl intake like an offenhauser off of e bay or clifford performance, but look for a used piece....it will save you big time.
A good working 4 brl carb would be the 390 vac sec holley.
Another route you could take is by going with the super 6 factory iron 2brl intake and use the holley 350 cfm 2 brl, I've done this and the ladder, But I also changed the cam to something bigger and ran headers which is something else you mught want to consider since the slant exhaust is very restrictive.
I maintained good milage and had enough pep to smoke stock small displacement v8's-302/273/smog 350's, gotta keep in mind it's only 225 inches...so you're doing very well accomplishing that alone...though with enough money you can make anything fast.
Question is how much do you want to spend?
No sarcasm from me.