340 or 360?

19DART66 said
The 360 has one claim to fame the 340 never achieved, and that was being the engine that powered the quickest american production vehicle in 1978 in a pickup truck.
I could be wrong but wasn't the X block that Glidden used to win pro stock in 79 based off a reinforced 318 block, I know they came with a 318 bore(3.91) from the factory and according to Mopar at the time could only except .150 over bore to 4.06 bore.

i have seen them out to 4.125, ran one myself at 4.100 with plenty of meat left.
They did come with a small bore as delivered, but this piece was a direct connection performance block with several upgrades over a production block. Top was basically stock, bottom was beefier by a good bit. Had ears as delivered, super nice piece.