3.9 Stroker
Some cars you could never fit a Mopar A engine into without a huge remake. This is why when Chrysler bought the Sunbeam car line of the Shelby TIGER, They had to sign a deal with FORD to supply the 260 and 289 Ford V8 as a 273 would not fit the small chassis. The 273 was too wide. But with a longer nose a \6 would have worked. ;)
In the 70's I owned a Tiger with a 260 2bbl 4 speed. DAMNSNAPPY car.