Three motor options

Thanks for the responses guys, there is one more piece of information that I haven't shared. I haven't actually picked up the 340 yet or paid for it. He's asking $1000 firm and that's for a disassembled motor. That's where my doubts are. If I buy a de-tuned 340 just for the date correct motor and it needs to be rebuilt anyways, probably with new heads, that is one expensive block I'm thinking. Sell the 440 and 67' 440 crank, take the grand on top that i was going to spend on the 340 and put towards a stroker kit for the 400??