anyone recomend descent leakdown tester?

i do to have studs holding the intake to the engine, and this engine was purchased brand new from mopar it's a 300 hp crate 360 magnum it came with a 4 barrell intake manifold, this engine has never had any head work and the motor has close to 20 thousand miles 16 to 18 thousand miles on it. It's always had synthetic oil ran thru it since break inn.
My dad purchased it brand new, and he put it in his hunting truck wich didnt get any miles put on it except for maybe 2 thousand miles every other fall to go hunting, other then that it dont have crap for miles on it. And my intake is a dual plane edelbrock rpm air-gap and no i dont remember seeing a plate under the intake?