First off, what are you after? Torque or HP? The advantage of a 408 over other strokers is that the stoke is a little bit less, and can rev a little higher. On the track that comes in handy. On the street it doesn't matter, you won't be pushing it to 6,500 on a regular basis.
OTOH, a little more stroke will produce a little torque down low, where most street cars need it. Also, on the street displacement is king.
With those two things in mind, I would consider these two alternatives:
1. 427W: more stroke, more torque, less rpm's, less hp. Can easily be done with a stock block and off the shelf parts. On the street it will last forever.
Besides, there's something magical about a 427 under the hood.
Check with a company called Performance Automotive Warehouse (PAW) for ready to assemble engines and kits.
If you really want a crate motor, call Gordon Levy or Mike Forte. They'll build you exactly what you want for about the same price as an off the shelf crate motor.
2. A blower. Easy to install, cheaper than a new stroker. If you're handy with tools, you can install it yourself in a week end, then take it to a tuner for some dyno time. Adds some "wow facter" , too.