Can anybody solve this hot start issue? I'm out of ideas!

340 If shut down it will fire right back up. Let it sit 15-20 minutes and I have to crank it. The carb doesn't seem to be getting hot now that I have the 1 inch spacer. (to the touch). I have another thread with he coolant get 210-216. http://www.forabodiesonly.com/mopar/showthread.php?t=196593

Mike (MLR) So here are some plug pictures. Oily ones because some dummy (Me!) spilled oil the other day cause he didn't use a funnel. So maybe I'm running lean not rich and that's causing both issues.

The plugs are Autolite 66.