i got a 360 with a 40 over bore.....

I run Felpro on my .030 340. (4.07) Just off the shelf Felpro....My piston is a Ross 10.5 and my "X" heads have beed milled.070 and my block had to have
.050 off to square up the deck height. It isn't o ringed or nothing fancy like that.. I've not had the heads off since '03....Felpro is the best in my opinion.