What oil pans have you tried? the road race pan is cool but I think it's too wide for the Spool mount k frame. I like the hemi pan I just had to cut the lip off the k frame and weld it.
That is a C body 187 pan in the picture. It could be made to work but I'd like a little more oil capacity. I tried a Hemi pan but the idler won't clear without making some major modifications. The Milodon road race pan won't fit the late model K frame without a lot of modification. I'm going to try the Mancini Hemi pan that has the 187 notch. That should be the perfect pan if it fits. It has the 6 qt capacity but it also has the 187 idler arm notch. So basically they took two good ideas and married them together. I haven't tried it yet so we'll see if it actually works like it is supposed to. If it doesn't work then I suppose it is time for something custom.
