I have a engine here with roller rockers and double hump heads and looked up the numbers and so far it can be either a 302, 327 or 350... These are the numbers 3932386 M 4. The M is in a square box and then 4 after that. On Mortec site or whatever it is say's 2 is 327 and 4 is 350 but when I got this engine the guy said it's a 327 but now I don't think it is. I am not sure which is better but any info would be appreciated! Two people told me it is a 327, I have second doubts. It's got a huge double pumper on it, roller rockers, Victor Jr Edelbrock intake, nice aluminum pullies, etc etc. It was in a old Camaro that was going to be a drag car and my friend I got it from took the engine and tranny out and got rid of the car because it needed too much work. He started it one time and said that it was the first time it was ever started. Now it will be going into my 54 Chevy HT. Also should I change the gaskets on it all or no? It's been sitting for about 3 years or so with oil in it.

Thanks a lot guys!