wanted 4bbl carb and intake

Going by his profile, he's in North Carolina....
If you still have the 675 casting heads, you'll probably want an aftermarket dual plane manifold like an Edelbrock Performer that is made for the small ports of those heads. Sometimes the large port manifolds (like the 340 and early 360 have) will cause a big hesitation (bog) on acceleration. Port matching can help but might not get rid of it completely. The later cast iron manifolds will work but they have lots of smog stuff on them and weigh 3 times what the aluminum one weighs. Decide on a carb (600 CFM would be about right) and then get a manifold that will match so you don't need an adaptor. Most of the modern carbs have the same air horn size that will match the factory 340 and 360 air cleaners. Other items recommended on this changeover are: 4bbl. kickdown linkage and dual exhaust. You might even consider a slightly bigger cam to make use of that extra breathing since you have the intake off already.