I sent you a private message with Brian at IMM phone number call him..He is in Indio Ca...build many...many mopars..He will also be able to order you the correct head gasket that you need.

Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)