Problem. My 77 454 lacks power on long steep climbs with the 5th wheel on. Starting out at 60 or 65 on flat ground at the peak of hill maybe be down to 40, and hoping it will make it. These were not real steep climbs like you get down south in the Smokies just rolling type here in the upper half of the lower part of MI. I'm not looking for 500hp but the advertised 230 is not getting it. Engine has 100230 mi. on it 400 trans. 3.21 rear. I think all I need is a bit more hp