So here's the deal. I am new on here and I don't really know how this works so I am hoping that I can figure it out. I just got a 1984 Chevy Camaro Berlinetta and I am trying to swap my engine from a 305 to a 350. My question is will I need a 4 bolt or a 2 bolt engine? Also, if anyone out there has any tips or advice about the berlinetta that would be great as I have been wanting a Camaro for a while and I have finally gotten one and I still am having a heck of a time wraping my head around it. lol.

You haven't given us enough info to help you. What are you wanting from the 350 swap? Any specific HP number, or are you wanting to beat your best friend's Mustang, or what? Is your car a stick or automatic? Is this going to be a weekend toy, or a daily driver, or a show car, or a dedicated racer?
95% of the guys who go talking about having a 4-bolt really don't get any benefit other than bragging rights.

In all reality it shouldn't matter too much between 2 and 4 bolt mains. I think what you need to look for is a two piece rear main 86 and earlier which will allow you do use the same flexplate. 87 and up one piece rear seal will work but you'll need a new flexplate. Not saying that you shouldn't do a one piece rear seal there are a few benefits of it but just be aware there are a few differences. Someone can correct me if I'm wrong.

'85-earlier for two-piece rear main seal, '86-later for one-piece rear main seal.

f**k the damn flexplate, the later blocks take the roller lifters. That's far more important.