Fiat 600d custom head and sump abarth. Abarth was a famous italian motorcycle tuner racer who loved small cars. He didnt get around to the 70s datsuns cause he retired then but you should see some of his stuff, It was the inspiration to the japanese racing industry. He could have made an a-series produce 250hp NA. He was the first to design a 16v head for the famous engine used on the fastest datsun of all the Rigoli 1200 ute. Lancia liscensed his design from the 60s to be used for the Lancia intregale 5 time rallye champion in the 80s.