I see your heep has a 4.7, don't let it get hot or it will start dropping valve seats. Also, the valve covers are a magnesium alloy and warp easily (the fix is composite valve covers) and keep up on oil changes or the timing chains will start to rattle (and need replacement). If you want to make a llittle more power there are H.O. parts out there, there is a company that makes adapters to bolt on any 4.6 ford manifold, including the one for the blower from the 03-04 cobra. Not sure if they make a full kit (belts and all) to put it on there and the pistons don't handle boost that well from what I hear.
Anywho, glad you are doing well. I would talk to your dad about taking over the business in the future (self employed > working for someone else), maybe work with him to see if you can turn things around and make better profits.