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NIcholas, a few comments from looking over your web-page
the gearbox is an english hewland, not Holinger, and its used in a magnesium housing.
100lb valve springs is not really a useful statement. You might have meat to say 100lb seat pressure??.
if I remember correctly, all the GpA supras had 65mm throttle body and there was nothing special about it, just the homologated part
The crank mods in that period were typically limited to getting the weight right. in some cases heavier turbo cranks were selectively machined down to the weight of the non-turbo crank, which was often the homologated one. thay way, the machining could be selective and have some other benefits.
I've sent you a PM about parts. cheers
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