Temp. sensor baffled!!!

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Picture of the engine but not of the problem.....
Hey all, new to the site and looking for info on what I need to get; building a 74 duster, putting in a 360 have an intake with a date of 3-6-87.. the thread for the temp sen. is like a coarse thread bought a sen. for a 87 engine, it seems to have the right thread but the probe that goes in the intake is to big won’t fit, bought one for a 74 engine, right size probe but the threads are fine thread!! Any help will be appreciated thanks...

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Picture of the engine but not of the problem.....
The second pic shows the size thread that fits, the temp sen. Probe is the size that fits.