On the grille block. Just closing off the upper portion to smooth flow across the hood is likely enough (the trade-off). Diesels run cool until they don't . . and the change is almost instantaneous (is how it seems). Vital to have gauge.
The wiper arms will come off with two stout flat-blade screwdrivers 90-apart and prying upwards. Hit the area underneath with a penetrant first (I wouldn't do this, though; safety trumps 1/100th mpg).
As to using EVANS in the big truck FE world a bit of consensus is that the temps the engine will run afterwards are so high the head gasket fails. IOW, if it wasn't designed for those temps, don't. On light duty trucks (as we have) the FORD guys have some success, but given the very high cost of conversion I'd look for other First Gen CTD owners who've done the conversion first.
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