Wish I'd come in sooner - I've just spent several months researching the differences in the earlies for my '70 45.
Ribbed dash ended in '72 [US market ribbed dash ended in '67 when their FJ45 run ended - they went to a padded dash for their ADR's]
Clear indicator lenses are '68-'70; amber lenses are '71-'73
MPH ended in '74 as you said Ken
Ken your taillights on that one that needs rescuing are aftermarket period caravan/trailer lights - I know cause I bought a set for $7 for my 45
Also Ken - those taillights in post #20 [top pic] are stock '71 SWB taillights, but bigger than our american brethren and will contain an indicator I believe..
Engine bay vents deleted '68-'70
Martyn, engine is correct vintage [oil fill on block, not rocker cover]; you also have the crank handle slot on the front bumper, as well as a set of footman loops on the rear of the tub! She's dead stock I reckon. I even think your rear bumperettes have never been removed and are still correctly oriented!
Anyway, enough from me. Nice truck mate. Glad another early is to be restored.