anyone recomend descent leakdown tester?

This engine has spent more time not running then running thru out its life... but it just doesnt have that many miles, like i said its got about 16 to 20 thousand miles on it max. compression test checks out, every cylinder hits 150 psi on the dot, it has 18 inches of vaccum at idle and pretty stable vaccum too, so that pretty much leaves ether bad valve guides or intake valve seals, correct? Also if it had an internal vaccum leak wouldnt it backfire thru the carb and run pretty rough? It has a fairly smooth idle, it doesnt cut out while idling and it never backfires thru the carburetor.