OE style pressed metal expansion tank for new all aluminium FE 427.

[AC Ventura]

Getting to grips with installing the new all aluminium 427 FE into my Autokraft MK IV.
Something I wasn’t expecting, not being overly familiar with US engines is that both the oil filter mount and the carb are set at about 3 degrees to the crank horizontal. Naturally, I’ve learnt that the motor is designed to be installed tail down, 3 deg to the horizontal, so the carb and filter are level and that the diff output needs to mirror that. Glad I spotted it, but so far so good.
Now we come to the replica OE style, pressed metal expansion tank, that I need to have built from scratch. On the Pond block, the vertical mounting for this tank is not at 3 degrees. Instead it’s dead vertical. So to end up with the expansion tank level, the brass tank needs to be constructed with the input face set at 3 deg to the vertical.
Seems clear enough to me. Can anybody else kindly concur that lm on the right track here?