I am also wondering where this 70 degree comes form. The manufacturer Behr
lists the 85 degree version for the 3200GT and the 80 dgree version for some other (maserati) models. For the 80 degree versions ther are plenty of potental other sources available , only the 85degree seems to be 3200GT specific.
The 80 degree version has codes (is used in cars: (i found also some others compared to the previous list)
alfa 60 563 488, 71 711 978
Chrysler 04741778, 4741778 TH40980
Alfa romeo : 0060563488 - 0071711978 - 1892030075 - 119000106402
Behr thermot-tronik : 30177.80 - 6.412.80 - C.659.80
MATRA (F) ESPACE II (J/S63_) 2.2 (J/S637, J63G) 79KW / 108PS Calorstat by vernet : 6570.80
Chrysler : 04720432 - 04741778
Fiat / lancia : 8830331 8830331 , 08830331 , fits for Fiat 650, 650DT, 650S, 750, 750DT, 750S, 850, 850DT, 850S, 880, 880DT
Indeldis kx 7 : 29.14.290
Quinton hazell : QTH551K
Steyr : 1.409.06.0002 - 409.03.02
Valeo : 820499
Wahler : 4341.80 - 4378.80 4158.80, 4158.80D 13 38 466 OPEL
3 901 2004 F VM
4778 975 CHRYSLER
7 072 643 FORD
91 153 670 VAUXHALL
GTS 287 ROVER
PEL 10009 EVA ROVER
RTC 6673 LAND ROVER