were those air or water cooled? im thinkin air cooled. could the lean condition caused by the intake leak of caused the over heating?if water cooled a lot of times the thermostatatic switch would go out and we just hooked the fan up on a toggle switch.looks like a heck of a buy. ive bought some old wheelers like that and drove them for years. the ones that didnt work out i would part them out over the winter on ebay and ussually came out way ahead of what i had in them. good luk with it!