Lister Petter Engine

[Dail R H]

   I saw an invatation to bid on a surplus site for a Lister Petter model --3901479TX3A001. Supposely about 35 hp, ran ,but had knock. What is it likely to cost to rebuild? The engine is within easy driving distance,so I may bid on it if it would make a good gen engine.
   The site is Gov Deals .com, it's under machinery I think if tou want to look

           Dail