the LD 340 will not fit magnum heads..magnum intake bolts are vertical...

...also the magnum heads stock springs dont like lift over .500..the retainers hit the valve guides..

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)