Thank you for info gave me, Mr LEEA
I will check the crankshaft stroke. It can be done, because engine is disassembled. This mangusta must be for European. The reason why I guess this would have hi-po engine is the wiki for mangusta. It says the European model was fitted with the 306 hp Ford 289 engine. now I doubt the written in wiki. Somtimes wiki includes the unsure info. Anyway few mangusta remains in Japan. I don’t know others. But you say one of them has 351 engine. Is it true? I want to see it.