Yep no 351w tunnel ram ever made
EVER.

You have to use a 302 TR with the spacer plates.
Murff on this website has a plethora of information on the subject. Hopefully he'll chime in.
IMO i love Tunnel Rams. Id have one on the Pinto If i could swing the cost. Id want a polished and coated one. Then id have to have the polished and plated carbs. Ohhhhh $$$$$$$$$$$