273 motor

Is your 68 273 original? Does it have a 4 barrel intake and carb? I have seen in the parts book that the Commando engine, Super Commando was the 383 in 68 Barracuda, was supposed to be available in 68, but have never heard of one in actuality. Find your casting numbers and dates on the block. 68 should have the VIN on the block along the bell housing mating line. I have put "72" 340 "J" heads on a 273 without notching the bores, But they were 1.88 small intake valve heads, the 273 block was bored .040, the heads were milled .040 and .038 on the intake side to get 65 cc chambers, I used offset dowels to center the chambers on the bores, used Felpro head gaskets, ran a stock "72" 340 cam and double roller timing chain, and checked everything 3 times to make sure I had clearance everywhere so nothing would go bump.