2/4 and 2 or 4 bolt main bearing?

[roadrunner-europe]

Hello everybody,

after having new problems with my engine, i search some informations about this engine.
The engine # 3970014
Now i find out, that the engine did his work in a camaro and was built between 1970 and 73. This website says, that it´s either a 2/4 or a 2 or 4 bolt main bearing is? Because there is a difference?
I have to change the intake manifold gasket. could anybody tell me, if I have to install the restrictor(s) at these gaskets or not. If so, on both sides or only left or right?
could anybody tell me, if I have to use a sealant under and up the gaskets especially under these small (rubber) one at the front and the end of the motorblock.
I changed these gaskets 3 weeks ago and 3 days later i´ve seen, that the small one at the end and at the front were pressed out. I installed them with sealant.

Thank you for informations

Chris