Most decent auto parts stores sell leakdown testers for about 80 bucks. You will also need an air compressor to use it.
I recently checked mine and all cylinders were 10-12% leakage. A new just broken in motor usually shows about 5%. I would say if it is 20% or above you have a problem.
Also the testers come with pretty easy instructions.
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1988 Mustang GT
stock bottom 302, C4
10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN
1989 Mustang notchback
Warmed up 306 with a Procharger.
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