magnum intake waterneck
ma mopar went to the smaler thermostat before the magnum engines,its a chevy size thermostat sorry to say,and probably a chevy water neck would fit,,and probably work,,i have an old offenhauser in take converted to a blower intake,no room under the blower for a mopar water neck that points straight up,,i use a chevy water neck,same bolt pattern,,
the older LA thermostat housings had the relief in the t housings and the intake was flat,,the chevy is oppisite,, so i had to have the water neck put ina lathe and turned to accept the t stat,,easier then miling the intake,,
but from the intake pic i see on this topic,the intake has the relief cut in it for the t stat,, so im sure a GM water neck will work,plenty of after market water necks with O-RINGS for a no leak seal,,i use an after market aluminum water neck on my early hemi with an O-RING no sealant,,no leak,,,
hope this helps some one