Modified like this one is this is, these are the third best manifold you can use. It will support over 300HP in this form on a moderately built engine. All threads have been chased and there are no cracks that I can see. One Tstat housing thread is 5/16 the other is 3/8 so I have put 5/16 external thread studs in both.  It seems to have a nonleaking choke tube through the exhaust plenum.  I am not too enthusiastic about selling it but if someone wants it for $275 I can bring it to Columbus for you. 

Also if you want this done to your manifold, I will do it for $100 plus shipping.  These weigh about 30#

Doug T

The Highlands, Louisville, Ky.