[suburban man]

I have owned a 2000 series cub since 2004 but was at a customers house yesterday and he had a model 129 in the front of the garage. Original owner since 1974 he thinks, said it hasnt been used for 8 years but he starts it occasionally. Burns oil due to worn rings- original Kohler engine still on it. He has all the parts for a complete rebuild- rings, gaskets, decals, tailight lenses, trans fluid,etc. all manuals and a good deck , snowblower, wheel weights and chains, He said he would like to get his money out of the parts he has- $150.00. I gave him $200.00 and told him I'd be back to pick it up with a trailer. Question...what can I expect to run into with the Kohler rebuild? I have good experience with engines but none with Kohlers. Can I expect to just hone it and drop in rings or do I need to go oversize and do valve guides and lap or grind valves? I understand that it depends on condition of the cyl. but was just wondering what is usually found. Would I be better of repowering it with a modern overhead valve engine? I'd sorta like to keep it original. Thanks for any input. Dave