different approaches to implementing program counter
Your current code doesn't match your schematic. With two separate regs for q_inter and Q, what you've created is the circuit below (omitting the clr and ld signals for clarity):







simulate this circuit &ndash; Schematic created using CircuitLab

But you don't need an inout for this either. (inout reg is a contradiction -- a reg drives a value, making it an output almost by definition.) All you need to do is either remove q_internal, replacing it with Q, or make q_internal a wire and assign it a value in a separate combinational block.