Carl,
The stock manifold uses a throttle body, so that's probably not what you are looking for.
I understand that you could make the earlier manifolds work by modifying the center bolt holes. I have not done it but it seems feasable.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine