Well first things first, I'd refrain from cutting ANY of the TBI lines, as finding good ones later is going to be a bear.
How much time are you talking before you go injection? I despise hose, but for a temporary solution, properly rated fuel hose, properly secured, would probably be ok. At least some new vehicles use plastic line, so who am I to second guess plastic/rubber hose?
Does the motor have a fuel pump cam lobe, assuming this is still the TBI motor? That could be another challenge. But assuming it's easily set up with a mechanical fuel pump, I'd run it essentially like stock, with a return-line fuel pump, just in rubber.
Additionally, other than wiring, you are pretty close to injection otherwise, I would keep my eyes open for a beat up '87-91 that is intact injection-wise, and just strip the parts the PO removed/ruined from yours. The factory fuel line connections suck to deal with, but since you already have the fuel lines, you are far better off leaving them there, and sticking with the factory TBI sending unit, throttle body connections, etc. which you already have.
