Officially Swapping in a 6.0/2wd 4L80e into my 99 OBS Escahoe - GET DA WATER

[foreverfalcon40]

I was in the midst of purchasing injector's 8.1 Marines...The seller informed me that the 99 OBS has a return style fuel system and L92 Truck intake is set-up for Returnless...I need to convert as well as make custom TB cable bracket since L92 is orignally a DBW set-up. I was at work and he kinda pressured me into buying 8.1 Marine Injectors, modified fuel rails for the conversion and the TB Cable bracket. Honestly I paid 200 for everything...says it is possible for one of the injectors needs to be bleed. The only reason why I got the fuel rails is b/c of basically the price he gave them to me at. Price of AN fitting...my time and sweating my nuts off cutting into the fuel rails and having the AN fittings...not a bad deal. Just don't like being husselled.

Is he telling the truth...if so what else needs to be done as far as fuel system wise to get the conversion going? Also said I will NOT need adapters for the injectors...snap right into my harness.
Do I need a Aeromotive FPR now...do I need a ad a inline warlboro with SS Lines and fittings?