i have an xr3i engine, and a carb'd cvh from a mk3 , th emk3 engine has only 44.000 miles and is very clean , the xr3i engine is puffing smoke and smells oily when running and the owner had a bottle of oil in pass footwell ... burning oil i think, can i put the head off the 3i on the block of the carbd engine, there both 1600