last year i purchased a 79 caballero with a 350, the previous owner pulled the engine from a 86 chevy truck, last month I pulled engine and transmission while doing a transmission swap and figured i would put new gaskets on the engine while it was out. also figured i would add some HP, after tearing apart the engine I identified it had 305 heads on it with casting number 14022601, I visited many databases with conflicting info, some say they are 53cc and some say 58cc, also some say valves are 1.84/1.50 and some say 1.72/1.50, im not sure how to tell which valves are in the head or what cc they are, any ideas???