you could always replace that oil feed fitting with a 90 deg fitting that is lower profile than a tube bend can allow. you would need to make a new tube but that's pretty easy. maybe get you enough room. just remember the engine will torque up and move some as well. how about a dimple in the firewall to allow the fuel rail protector clearance. or a recessed firewall to allow everything to fit plus an accelerator pedal on the inside. will you use drive by wire or cable operated throttle?
a steel wheelbarrow tub would work pretty well for a recessed firewall or a section from a steel trailer fender could be used and added to if you wanted a rounded top look. somebody on here is doing a firewall mod right now with the round top look. check post 754 for a look
http://67-72chevytrucks.com/vboard/s...645774&page=31