I have a 383 LT4 and am looking at going with a h/c package from either loyd elliot or ai. I have read all the debates on this forum and i agree that either company is great compared to what people has got from them. I have no work to my heads or intake, but i made 390rwhp while floating the valves at 4700 rpm. I had to go with a 150 lb. spring. fixed that and never dynoed again. Ballpark what can i expect from a h/c package from one of these guys

 

You would need to talk to them about your usage and how much cam they would want to put into it. Can I guess you would send them the the current heads and intake to work?

 

What cam you running now?