Powered by a 354 cu. in. FirePower Hemi out of a 1956 Chrysler, a 1957 Dodge, or a 1956/59 Dodge pickup (“Power Giant”).  Making up to 355 hp it was the first production engine rated at 1 hp to each cubic inch. It’s a very heavy engine, though. Check out this 1958 Dodge pickup that I posted last year.