Im a new member and have never had a 6x6 i just bought a 1974 attex 295 wild wolf with no engine but it has the t-20 transmission i was just wondering what are the best engine options and most straight foward engines to install like i said im new to 6x6 i have heard 340 or 440 yamaha snowmobile engines,briggs and stratton 18hp and 18hp duromax. The guy i bought the attex from has a 1994 arctic cat 580 ext snowmobile that runs good that i could buy super cheap. Would that be a option or should i use something else. I forgot to mention i indend to use this 6x6 manly for fun and not racing it around. I would appreciate any help. Thanks again