Well the B-36 did use pylon mounted jets but these were an afterthought added on the B-36D. Originally it only used conventional piston engines that were disastrously mounted backwards in the rear of the wings.
The B-36 was a total dud with only 384 ever being produced and it suffered from constant problems mainly related to the horribly rearward mounted piston engines. Carb icing was a major cause of engine failure at altitude because of this. In front mounted engines the heat of the engine blowing back on the carb helps prevent this.
Perhaps I should have said the first "successful" plane to use pylon mounted engines or the first jet to be designed specifically to use them. On the B-36 they were just a last ditch effort to try and salvage a failure of a plane that was obsolete as soon as it was built.
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