I just finished installing a Weiand 8021 CJ/SCJ Stealth on my 429 a few weeks ago with no problem. It reccomended
oil resistant silicone for the front and rear gasket. Torguing to 10 ft/lbs, then 15 ft/lbs and finally 25 ft/lbs using the cross stitch patern. Retorque bolts after 30 minutes of engine run time......worked for me. Hope this helps.