I have a 1983 RX-7 (12A with a webber carb.) and I'm looking to swap to a 13B. I want more power in the car, street legal but not a daily driver. I'm wanting around 300-350 hp. I have talked to some mechanics who advised me to swap out the 12A. I'm just looking for some advice and guidance, I've never attempted anything like this. Not sure if I should go with a single or twin turbo, what other modifications will need to be done to the car, other parts I would need besides to the engine and transmission, porting the engine, anything else that I should know.

I would appreciate any advice and guidance that I can get!