I have a 1973 Hamtramck built 340 car with a scheduled production date of 5/25/73. My original engine is MIA and I am trying find a period correct replacement. My question is this. Does anyone else have an original Hamtramck built 340 car with a similar SPD, +or- a day. If so, what is the casting date of your 340 block? I understand that theres roughly a 90 day window for this, but I thought I might try to narrow it down a bit more. Thxs for your help.