I ran on the passenger side using steel tubing, 3/8 for supply and 5/16 for return. I did this for a couple of reasons, number one, the EFI supply was configured for passenger side on the proflo 4, although it would have been switchable to the driver side.
Number two, the brake booster, all the brake lines and the proportioning valve are all crowding between the engine and the fender well on the driver's side, so there were simply more room on the passenger side.
Number three, I do have dual exhaust so clearance to exhaust is equal on either side, but there's more room on the passenger side frame rail to attach stuff.
Lastly, if I decide to use the Edelbrock EFI sump, the passenger side fender well might be a good place to install it.
THX,
JB