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..

I always pushed the tabs down but make sure you get plenty of sealer around the tabs.

Edelbrock also make that carb flange plate.

I know it's a stocking item at the local parts america/kragen outlet.

I actually have some steel plates that were isolators I guess that look just like that plate except thinner and square on both ends. I assume this has the spreadbore on one side?

I had my carb on there already with just the square gasket and it seemed to work fine but I just wasn't sure which gasket to use or if using the square gasket on that spreadbore would cause the fuel/air to not disperse correctly.