318 exhaust manifolds on a 360

Although the casting number 53010187 looks like the large hole manifold...IT IS NOT>
So watch out for that one too. I had done a lot of research before I started trying to answer the OP's question. I've done more since then and as it turns out there is more than one member who has used the magnum/Dakota large hole manifold on the late and early 60's a-body. Unfortunately the members who accomplished this feat don't always show or give the casting numbers or actually show the measurement on the hole. I would love to see one exhaust hole measurement showing a 2 1/4" factory small block hole that IS NOT a 340???
There's some confusion in my mind on whether the driver's side casting should be 53006617 or 53006619??? The internet magnum "fact" sights say 6617 but some other people say 6619, so that's still an open question for me?? The cars that this manifold was used on had manual steering and they had to modify the steering shaft (sometimes) and also raised the engine 5/8" of an inch (or so). So evidently it is very possible with manual steering and even possible on the 65/66 bodies. It think there should be a "sricky" on this subject because I'm sure many members have interest in the facts as they are found. Unfortunately if you get too many "stickys" you push all the other important threads down on the page and I don't want that.

Treblig