mine runs alright on the street for a daily , mine is the newer sportsman aluminium unit .
You will need to address T slot jetting , PVCR jetting and lower the idle feed restrictor .
A bit time consuming .
I did try an adapter - what a waste of time and money .
I feel , my experience , that whilst a 4500 is better than a 4150 if your heads are the restriction you may not see a big gain . I picked up more consistency with cnc stealths and 4500 carb/intake but less than a 1/10th . Put TF270s on and picked up just over 1/4 second , same intake and carb .
Oh and fuel consumption on street and strip went south with the 4500 , but I accept that trade off for the et and mph gain
Hey its a race car I drive daily

Tex