I am getting ready to put my intake back on my 340 and won't be using the front/rear cork gaskets so should I cut off the head gasket tabs beforehand or just push them down and use silicone over them? I already had it running but it was leaking and I don't want it to leak again.

Also, the M1 intake I have is machined for a spreadbore type carb. Since I am running a holley 4150 carb do I use the 4150 type gasket or the spreadbore gasket to match the intake regardless? Enquiring mind wants to know..