Yes, the 3796 is a GT390 carb. Like the 6361, it has some strange behaviors. I had to install an adjustable pod to get the secondaries to open slow enough so as not to cause a lean hesitation. I put adjustable primary and secondary metering blocks so I could tune the power valve and idle feed restrictors.
That carb doesn't have a PCV port, so beware. The 390 used a tube that connected to opposite runners on the intake as opposed to a port in the main plenum. I tried one of those expensive 428 carb spacers (that has PCV port) and it won't seal on a typical intake or carb....there's a portion of the pcv port that's doesn't get covered and would result in severe vacuum leak.