Today, dollar for dollar, is the 318 faster than the 340 ???

So the cost of 340 blocks and factory heads as far is I can see is the cost difference. What's a rebuilds rebuildable 340 short block worth? Then add in 340 X or J heads.

So just the 340 short block is a considerable amount. Dollar for dollar I think 318 has it.

We have a 69 or so 340 with X heads sitting here someone took out of a dart or cuda and stuck in a 72 d100 pickup. In that situation the 340 wins depending on core shift. Or search for a plentiful supply of 5.2 blocks without a lot of core shift. Possibilities are endless