In reference to the intake manifold , I just took a piece of tubing that was close in size to the manifold ,measured the o.d. and i.d. of my existing manifold ,chucked the tubing in the lathe and turned the tubing down to match my manifold ,Then I cut two pieces and welded them to the old intake manifold . Last ,was a grinding and polishing until I had the fit up I needed . Just take your time and you can do it . By the way ,depending on whether you use tall or short K Model cylinders may determine if this step is even needed , it's all a case by case situation . You might even want to consider using O Rings but with all the problems I have heard caused by modern gas eating O Rings I think the use of the old screw type manifold nuts with the new Peek seals (which you can get from Bruce at Enfield Racing ) may be the ultimate solution derived from the combination of new and old technology . Hope this helps.