Well, I'm no expert, I just enjoy tracking info down 
While looking at your first bunch of pics (which I copied and posted as the first picture below) then yes, just by looking at the valve cover and lack of oil intake tube on the right of the engine, that engine looks like an F155...and I say looks like, because often people swap parts from one block to another, but the lack of oil fill tube is a pretty big give away. EDIT: So you state that the Vin number on the engine in your 40 is F 407242. Well, according this this chart (http://www.sor.com/fengine.html) ...well, that puts it in 1972, between August and December. So I was correct...it is an F155
So, the second image I posted below (F203012) is not the engine in your 40. Is this the same engine as in the third picture I posted below??? This motor is not from a '69/'70 FJ40...at least not originally, as I have already outlined that engine F-290409 is dated to 08/69, and then one year later F-325624 is dated as 09/70...neither of these is close to your F203012.
Then there is a third engine picture that you posted, which is the third picture I posted below. This is an F 135, or at least it looks to have all that an F135 should have, What is the F serial number on that engine? Is this F203012?? Then this engine would be circa 1966

While looking at your first bunch of pics (which I copied and posted as the first picture below) then yes, just by looking at the valve cover and lack of oil intake tube on the right of the engine, that engine looks like an F155...and I say looks like, because often people swap parts from one block to another, but the lack of oil fill tube is a pretty big give away. EDIT: So you state that the Vin number on the engine in your 40 is F 407242. Well, according this this chart (http://www.sor.com/fengine.html) ...well, that puts it in 1972, between August and December. So I was correct...it is an F155
So, the second image I posted below (F203012) is not the engine in your 40. Is this the same engine as in the third picture I posted below??? This motor is not from a '69/'70 FJ40...at least not originally, as I have already outlined that engine F-290409 is dated to 08/69, and then one year later F-325624 is dated as 09/70...neither of these is close to your F203012.
Then there is a third engine picture that you posted, which is the third picture I posted below. This is an F 135, or at least it looks to have all that an F135 should have, What is the F serial number on that engine? Is this F203012?? Then this engine would be circa 1966

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