Which SBM for the Mopar vehicle

You would flat be AMAZED at how, uh, "sufficient" a decent running, bone stock 273 TWO bbl is for power. I actually had one in my 70 RR !!! ??? !!! (whut?) THAT IS RIGHT!!! I swapped a 340 into my formerly known is '70 440-6 RR in about ?73? during the gas crunch. AFTER I got out of the Navy, came home, some time later, I decided to sell the RR (biggest mistake I EVER made!!) so I yanked the 360 out of the FJ-40 Landcruiser and prepared to stick the 340--in the RR--into the Landcruise. BUT I NEEDED A 3rd "wheel." So I bought a well worn 273 from a guy for FIFTY BUCKS and just dumped it right into the RR. One thing "not" stock were the headers already on the car. THIS WAS NOT a Commando!!!

You are talking about a RR, weighed over 3800, with the big 'ol Dana 60 3.54 and 18 spline 4 speed, and that little bitty 273. My friends and I were equally amazed. It was completely driveable.