My friend just bought bought a 93 RX7 shell. He heard that the 13b's have a common problem of dieng within a short period of time. He is thinking about a doing a 20b swap/port and polish plus the boost. Now, what do you all think about that? is there a better swap? any idea where to get the swap and is there a GOOD shop around here that does swaps?

Also, if you have any recommendations, thoughts and things that i have to pay attention for, it would be greatly appreaciated.