How Would You Build The Perfect Sleeper?

J-Lop all star Bumblebee proposed this one, apparently after getting spanked by a hopped-up CJ-7. Bumblebee isn't alone, as we got spanked by a sleeper recently. Pulling up a red light we notice a Caddy CTS in the next lane. It had but one tailpipe, meaning the car was not the awesome CTS-V. The guy starts gasing the car like like crazy, indicating that he's ready to go. We reel off the numbers in our head. We can hit 60 mph in about 5.5 seconds in the WRX, assuming we get lucky with the clutch. He's looking at 7 seconds, easy. This one is a no-brainer. We rev back at him. Light goes green and... turns out (after we tracked him down at the next light) that he had dropped a turbocharged LS1 from a wrecked Callaway into his Caddy. He was claiming 4 seconds flat to 60 mph. We have no reason to doubt him. Our ultimate sleeper would consist of that engine in some sort of wagon. Preferably our old brown on brown 1985 Pontiac Parisienne Safari Station Wagon. And we realize that's just us. So how about it? Describe your ultimate Q-ship.

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Related:
Sleeper of the Day: Plymouth Reliant; The Jalopnik Question of the Day [Internal]