Hello,
My 1968 Dart Hardtop is a numbers matching GT 273. But 2 year ago the Dart was cloned to a 340-S GTS. (of course I am keeping all the original parts from the GT 273 incl. Broadcast Sheet). Original 1968 GTS Power Bulged Hood, 727 TorqueFlite, 8 3/4 Rear Axle with Sure Grip, etc. etc. But the engine is from an early 1970 Dodge Challenger 340 (Engine dated code July 9th, 1969). What I have so far is an original restored 340 Air Cleaner, an original AVS Carter Carburetor Code 4425S and the X Head Code 2531894.
In this case it doesn't matter which production day the intake manifold (Code 2531915-2) has. Important is the period from the 1968 model. June 1967 until June 1968.
Thank you
Roby