Dear Borzacchini, please be more careful when describing your pictures. First you´ve tried to let us believe a standard GTA-2v twin plug head could be a 4v-head (4v heads usually do not require twin plugs any more....the late FIAT TS/"AR" system is much more a marketing idea than technical requirement); now you´re showing us a totally standard 75type style head installation trying to convince us to be a 4v-head.Famous is his 16V 1300 minored to 1100 and equipped with Garret turbine that produced 250 HP and was installed in GTAJ Gr.5 known as “Bomber” because of sound that produced during races.
This engine NEVER ever is a 4v turbo engine with whatever displacement you talk about; it looks like a 2v-TS from an AR 75 TS with a retro-fit turbocharger. Intake m/fold and everything at this side look very, very standard equipment from a Series IV Spider. Count the numbers of plug leads so you should believe a 4v head could get into troubles fitting two plugs and 4 valves into one c/chamber. For which reason this should have happened is secondary also; especially regarding the fact Angellini heads always featured sophisticated design work very comparable to Cosworth heads. If only AD would have cloned the Angellini style....
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