Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I have an old Ariens 7 HP snowthrower with a blown engine.  The model#924038, with the engine H70-13021OD. My problem is trying to find a replacement engine.  Ariens had Tecumseh e-mail me that the old engine is unavailable but an 8HP #208102A would be a good replacement.  The only trouble is no on-line is familiar with this part.  The engine has a 1" c/s with 2 13/32" length.  I really don't want to spend  a lot of money to replace an engine for probably an over 20 yr old snowthrower, but when it threw snow it went thru anything.  Can anyone suggest a replacement engine any brand ?