2nd, I have one all but done on an engine stand. Having run almost all Mopar engines in a 4 speed car. Keep in mind I am a street high performance everyday driver. I want performance and mpg as I would, and still do, drive from the east coast to South Dakota and Nebraska on a yearly basis. We are talking 12 to 15 hours of straight driving at a constant 70 - 80 mph per day for two days. The 66 Barracuda does not make that run anymore, but has in the past. Always nice to get low to mid 20's mpg and a good 273 is almost as quick as a 340 the way I build them. The 273 and the 340 are similar with the heavy duty parts like forged cranks, bushed rods, and floating pistons. The pistons in both are close to zero deck and I love a solid lifter cam, which comes stock in a 273.