I have a chip out of my boss's '68 chevy P/U. He installed a 350 TPI along with the 700R4 trans. The computer and wiring harness he bought through a company called Fuel Injection Specialties. He had been having problems with check engine lights and drivability. He rebuilt the engine to stock specs and installed a mild street cam for fuel TPI cars. I took out the chip which was supposed to have been custom taylored to his application. When I tried to look at it with TC I got a window saying that the "source code has been modified and the checksum disabled." TC will allow me to continue but warns that it can not tell if the proper def. file is being used. Does anyone out there know what this means? If so please enlighten me?

BTW if i continue the chip's progaming is readable and looks like the only that was changed was to turn the vats off. I compared to a bin I have a stock 90 350 TPI. THanks in advance.