front main seal leak is common. you'll need a front main seal and the timing cover gasket, along with a tube of fipg. get oe toyota...the felpro seals are crap. do at least, the lower radiator hose while you're there.
kyosan is oe.
the carb will have a number/letter sequence stamped on it...that relates to build date.
if you have an airrail, i think pighead has one, but we don't know what vintage. if we spot it see what we can find out.
ige tlca #1431