im going to be putting an lt1 in my 85 iroc and was wondering about the fuel lines. my car originaly came with a carburated 305 and im not sure if those lines can hanlde the pressure or volume that its goin to need? also about putting in an in tank fuel pump, i got a walbro 255 and im not sure if the lines at the tank are able to run this set up? if u have pics of this set up please post but any help would be nice

Volume, no problem. They are 3/8" & 5/16", same size as LT1 (I will accept correction on the return line size, as I am going off fuzzy memory for that).

Pressure is not a problem for the hard lines. For any rubber under pressure, you'll want to change it out for EFI hose.

Also, just swap the sending unit with one from any EFI 3rd gen. Carb lines had hose clamps on both the feed and return. EFI systems operate at a pressure above what most clamps are rated at. EFI sending units have saginaw threaded fittings

thanks for the help