the GM based TBI kits on the v8 would be a decent cost savings and good parts availability. Run hard lines along frame up to the fuel pump area. When you go fuel injection you can use that with a surge tank and pump fed by the mechanical pump. The goal is to seperate air and fuel so the high pressure pump and injectors always have clean fuel since there is not a float bowl anymore. You could have a rear inline pump but it's been a pain in the butt working on the pump and filter below the fuel level. An in tank pump is ideal with good fluid control to keep it happy.