Most wheel suppliers will sell you wheels with any offset so order away. A mustang 2 front suspension is not a truck suspension, it is a SUB-compact car suspension. Also, remember Mustang 2 sounds better than Pinto and all Mustang 2's were nothing more than a pinto with different sheet metal. A M2 and narrowed control arms would be a waste of cash and would be a travesty of truckism.
There are better ways to get IFS and keep load capacity and safety. Quit talking to the folks you are talking to.
Do you know which stub is grafted on to your truck? Is it a camaro, C10, S10?