Small block cleaning??..

Many moons ago, I made some block off plates from some old wood underlayment left over from flooring. I just traced around an extra exhaust gasket, drilled holes to bolt it up, and put a little silicon on it before bolting them down. I cut them into 3 pieces per side so I could get the heads clean by the plugs. I added an oily rag into each exhaust port before bolting them on for extra insurance. The carb hole could be blocked the same way.