hello I am new to HP tuners but very comfortable with mechanical and electrical. have been a drivability/transmission tech for GM for 30 years. I know this may be and old Question, but I am building an engine for my 1998 chevrolet 2500 L31 and will need to tune it. was told by our local dyno tune guy that the PCM (black box) is not tuner friendly. have watched many tuning videos to learn the HP tuner and MAF,VE tuning. none of the stuff I could find was based on my platform. what are the things I need to Know to tune it. will I need to change to the 411 PCM. I have learned so much from this forum but need some more specific tuning information. any help would be appreciated. the engine im building is to tow my trailer and will not see 5500rpm. going to run TPI with 30lb Bosch injectors, AFR 195 heads and a GM 383 camshaft if it helps. thankyou for you time.