/6 170 exhaust manifold swap

i got a 170 slant 6 in my 66 valiant. and have an exhaust manifold from a 73 duster. i just wanna make sure it will work fine with the 170 before i start the swap. and what gaskets are the best for this job. i seen a gasket kit for 25 bux. has all the gaskets i need, the brand is felpro. any good? and another concern i have is that the duster exhaust manifold has the bolts that go onto the exhaust pipe built on it already. the manifold i have on doesnt so it has 4 bolt heads 2 on top and 2 on the bottom. the 73 exhaust manifold i guess only has 2 on the bottom. ill try to post some pictures later on..im a newbie to this so bare with me:newb:.if u were gonna do this job how would you do it? i dont wanna do a half- assed job. thanks for your help