Tuned Port Injection And Performance mods?

I have a potential upcoming build for an 88 corvette. The only issue is the customer wants to keep the TPI rather than using a quality aftermarket system to save some coin. I was wondering at what point the ECM needed to be reprogrammed to function in a mild streetable build? I'm thinking a 383 SBC around 10.5/1 compression with a mild cam. Any input would be greatly appreciated.