Previous MH had a carbed 454 in it, maybe there was something wrong with it but I doubt it. My current MH is a FI 460 and 5 ft longer. It can and does run circles around the old 454. Don't like the sound of the clutch fan... Install a 16" electric fan, mine comes on with the AC or when temps hit 210, rarely hear the clutch fan engage.:b As to heat and engine in the MH, install heat and noise deadener
LIKE THIS it is inexpensive and easy to do, with that installed my wife can easily carry on a conversation with herself.:b
Is this ideal? No, but most gasser MH's need this kind of help, it is the nature of the beast. By the way, for comfort I had to do the same things to my previous MH, which are both FW's.