you are right...fom what I have seen/read the 428 would not be on your hood
mine was built Nov 69.......red with white interior dragpack 3.91 car built Metuchen
when you say early built....what exact date?
some July/aug built 428 cars did not have rev limiters.....but seems by Sept 1 1969 they were on them...
you may to post on the 428cj site for specific 428 stuff
www.428cobrajet.comexhuast manifolds are diff for early/late 70 model and you will see that on the 428 component id site...
several small engine details pointed out there
the wood grain on dash( dark teak vs light but really 69/70 thing but usually wrong),the console has some diff........early 70 model no button to open,of course no sig lighter or seatbelt holders,
hood has some details underneath early vs late.....how far in detail are you going with this car?.....exact details or close?
of course heater hose color coded depending on build date...see Marti's site