340 tunnel ram

Like DJVCUDA said, the plenum size matters when it comes to streetability with tunnel rams. Smaller runners and Plenums are better. The Edelbrock STREET Tunnelram which are not made anymore, are the best streetable tunnelram for a small block Mopar. I got lucky and grabbbed one off of E bay last year.
Likewise the Weiand Tunnel Ram which dominated all other single, dual plane and even other tunnel rams in a manifold shootout in one of the car mags is the Best tunnel ram for a big block Mopar. Notice how similiar they look plenum and runner wise.
One Thing I've noticed over the years of seeing tunnel rams run is they seem to like Holley carbs better than Carters. Not saying Carters are bad or won't work, but just that you may be able to get a little bit more fine tuning and HP out of holley carbs.
Tunnel Rams got a bad rep from all the posers throwing them on stock motors, with huge carbs and or miss matched parts.
Like with any motor, if you take the time to match your carbs, intake rpm range to the cam rpm range, converter and gears you will have a good running, reliable tunnel rammed motor.