as far as i know they didn't change anything from 66.so if they didn't you are incorrect,i guess i shouldn't say that,most people would think like your talking:if it's a 70 block in a 70 it's numbers matching.but in reality to have a numbers matching block the number stamped in the block on the right side deck, the last 6 digits must match the last 6 of the vin.i am refering to a 66ss which i have and it is numbers matching,i will agree though that as for intakes,heads,exhaust manifolds,trans and rearends,you just have to get stampings before your cars build date and nobody will be the wiser.but on my 66 the 1/4 panels are stamped with the first 5 digits of the vin 13817,which denotes an ss,these would be hard to duplicate,but if you didn't know they were there in the first place(uneducated)you wouldn't think twice about it.i like to go on ebay and check out 66ss's and just cut em apart.i see em with 67 dashboards,seats,steering wheels,door panels.incorrect p.s.,dual cyl master cyls.incorrect vin numbers,later engines and on and on.with all the companies making reproduction emblems etc it is pretty easy to make a fake that would fool 90% of the general public.heck you can even buy a whole new 69 camaro now days.